Tight-fill fruit packing /

C54

Children's Clothes

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Supporting brace sizing in structures with added linear viscous fluid dampers: A filter design solution

Viscous fluid dampers have proved to be effective in suppressing unwanted vibrations in a range of engineering structures. When dampers are fitted in a structure, a brace is typically used to attach them to the main structure. The stiffness of this brace can significantly alter the effectiveness of the damper, and in structures with multiple dampers, this can be a complex scenario to model. In this paper, we demonstrate that the effects of the brace compliance on the damper performance can be modelled by way of a first-order filter. We use this result to formulate a procedure that calculates the stiffness required by the supporting brace to provide a specified effectiveness of the damping action. The proposed procedure assumes that viscous dampers have been sized in a previous design step based on any optimal methodology in which, as is usually the case, the presence of supporting braces and their dynamic effects were neglected. Firstly considering a one degree-of-freedom system, we show that the proposed method ensures a desired level of damper efficiency for all frequencies within a selected bandwidth. Then the analysis is extended to the case of multi-degree-of-freedom systems to show that the design criteria can be applied in a straightforward and successful manner to more complex structures

Getting warmer: a field trial of heat pumps

Given the lack of data on heat pump performance in customers’ homes, the Energy Saving Trust in partnership with the Open University undertook the first large-scale heat pump field trial in the UK to determine how heat pumps perform in real-life conditions. The year-long field trial monitored technical performance and customer behaviour observed at 83 sites across the UK. The findings provide valuable information about the factors that affect the success of a domestic heat pump installation. Instead of revealing outcomes along statistical grounds, or acting as a “brand-vs-brand” competition, the field trial findings provide a discussion of key points of interest to potential consumers, including: • Measured coefficient of performance (COP) and system efficiency • Installation practices (both system design and performance) • Customer behaviour (contribution by the Open University) • Heating patterns and average internal temperatures • Economics This report makes recommendations for consumers, installers, manufacturers and policy makers, and identifies areas that require additional investigation and research

Guide to Streamlining Series: Making Streamlining Stick

You have decided to streamline your grantmaking process -- congratulations! Your organization could be just beginning to explore ways to make your application and reporting requirements less burdensome to grantees. Or you might have a team deeply engaged in a change process already. This framework illustrates the four basic phases that many grantmakers move through as they streamline and suggests activities and questions that can propel your process forward

Internal Design of a Hydroponics Greenhouse for Tri Cycle Farms

Hydroponics is the agricultural technique of growing plants without soil, using other growing media and added nutrients in a solvent. It is an attractive agricultural method over conventional agriculture because it is more water efficient, is less labor intensive, yields higher quality crops in less time, and is easier to control. According to the Digital Journal, “hydroponics crop value is anticipated to grow to USD 27.29 Billion by 2022 at an estimated CAGR of 6.39% from 2015 to 2020” (Sawant, 2016). Alongside this growing market acceptance for hydroponics, there is also a local demand that requires only a small transportation cost. For the past several years, Tri Cycle Farms - a 501-(c)(3) non-profit urban farm in Fayetteville - has dreamt of building a hydroponics greenhouse because it would provide a source of sustainable financial income, a location for educational programming, and a means of battling food insecurity. Since August 2017, I have been working with Tri Cycle Farms to help make the hydroponics greenhouse project a reality. The objectives of this section of the overall project are 1) to determine desirable crops to be produced, 2) design the internal layout of the chosen greenhouse, and 3) design one hydroponics system using engineering design and fluid mechanics. This thesis report outlines the process of fulfilling these objectives, the justification behind the design decisions, and a discussion of the potential implications moving forward

The Effect of Shear and Alum Addition on Alkenyl Succinic Anhydride Retention

Alkenyl succinic anhydride is an effective sizing agent involved in alkaline papermaking. There are many factors in the alkaline papermaking system which effect the retention of the sizing agent. This study reviews factors which influence sizing and the effects of shear and alum addition on the retention of ASA. The Dynamic Drainage Jar was employed to subject four levels of shear on the system and Hercules size determinations were conducted as a measure of retention. Alum is necessary in the system to provide proper retention of the ASA. Retention of ASA with alum present was found to increase with increasing shear until a point of 1000 RPM was reached. After this point, retention decreased sharply