Spartan Daily, November 18, 1977

Volume 69, Issue 55https://scholarworks.sjsu.edu/spartandaily/6276/thumbnail.jp

Development of a grow-cell test facility for research into sustainable controlled-environment agriculture

The grow-cell belongs to a relatively new category of plant factory in the horticultural industry, for which the motivation is the maximization of production and the minimization of energy consumption. This article takes a systems design approach to identify the engineering requirements of a new grow-cell facility, with the prototype based on a 12 m X 2.4 m X 2.5 m shipping container. Research contributions are made in respect to: (i) the design of a novel conveyor-irrigation system for mechanical movement of plants; (ii) tuning of the artificial light source for plant growth; and (iii) investigations into the environmental conditions inside the grow-cell, including the temperature and humidity. In particular, the conveyor-irrigation and lighting systems are optimised in this article to make the proposed grow-cell more effective and sustainable. With regard to micro-climate, data are collected from a distributed sensor array to provide improved understanding of the heterogeneous conditions arising within the grow-cell, with a view to future optimisation. Preliminary growth trials demonstrate that Begonia semperflorens can be harvested to the satisfaction of a commercial grower. In future research, the prototype unit thus developed can be used to investigate production rates, plant quality and whole system operating costs

The Trail, 1965-10-29

https://soundideas.pugetsound.edu/thetrail_all/1911/thumbnail.jp

Design and fabrication of a Wing for a Remote-Controlled Electric Powered Airborne Imagery Platform

This documentation basically explains in detail about the project's planning, progress andachievement throughout the two semesters projectduration. Thereport began with introductory and background information of the project. This section generally explains what the project is all about. The general objective is to gain experience in handling engineering projects from the startto the end. After that, the scope of study involved was laid down to summarize what aspects of the project would be tackled. Engineering projects in the real world involves numerous engineers from different fields, each handling different parts of the project. This project was divided into 3 parts. The one in context ofthis report is to design and fabricate a wing for a remote controlled electric-powered airborne imagery platform. Hence, corresponding with this topic, the scope of study is mainly the aerodynamics ofthe wing, the fabrication process and the structural strength ofthe wings. The wing should be able to generate enough lift for the aircraft to fly, and at the same time being light and robust enough to support the aircraft during flight and landings. The report then continued with the literature review done on the project. In this section, various related information extractedfrom articles was included and elaborated. The next section is the methodology section ofthe project. This section explains the planning involved for this project, which includes process flows for both semesters, tools used, and the detailed Gantt chart which shows the exact timeplanning of the project. Then, in the results and discussion section, important findings and results of project activities was discussed and analyzed. Decisions and choices that were made was discussed and analyzed to show that they are verified. Finally the report was ended bythe conclusion of the project andrecommendations for future continuation of this project and also for the UTP future final students as a whole

The Mount Vernon Republican: Vol. XXII No. 51, December 5, 1876

The Mount Vernon Republican was a newspaper published weekly in Mount Vernon, Ohio.https://digital.kenyon.edu/republican1876/1047/thumbnail.jp

Study on CO2 Corrosion in Oil Producing Well

The purpose of this project is to study the CO2 corrosion in oil production wells and the focus of the study will be on the tubing component of the production string. The main objectives of the project are; a) To study the material used in a well production string. b) To determine the average CO2 corrosion rate of a typical well production string. As for the problem statement of this project, in oil and gas industry, CO2 corrosion has been a recognized problem in production and transportation facilities for many years e.g. in the tubing string of an oil producing well. The corroded tubing will cause leakage and tubing failure hence, disrupt oil production. The scopes of study for this project consist of identifying the rate of CO2 corrosion during the production life time of the tubing string and determine the factors leading to the CO2 corrosion. In order to provide a reliable prediction on the behavior of CO2 corrosion on tubing steel, the project’s methodology used Weight Loss Method using Autoclave Machine and Linear Polarization Resistance Method (LPR) to simulate the actual environment in the tubing during the oil production and analyze the CO2 corrosion rate. The laboratory experiments are conducted on API L 80 type steel. The Weighted Loss Method is conducted in stagnant condition using 3 wt% NaCl over a series of parameters which includes pressure = 10 bar, 40 bar and 60 bar, pH=5 and temperature at 25 ̊C. The LPR method is conducted in flowing solution using 3 wt% NaCl over a series of parameters which includes temperature = 25 ˚C, 40 ˚C and 60 ˚C, pH = 5 and pressure at 1 atm. All data were collected and analyzed using Weighted Loss Method, LPR, SEM, OM and Hardness (Vicker) Test to determine the CO2 corrosion rate and the effects on the L 80 steel. As for the findings, the average CO2 corrosion rates in API L 80 steel yield from the laboratory test ranges from 1.3 mm/yr to 4.7 mm/yr

Natural regeneration and management of birch

This thesis offers guidance for those who want to naturally establish, maintain and manage birch in monocultures and mixed stands. Silver and downy birch are the most common broadleaf tree species in northern Europe. In Sweden, the two species together make up approximately 12% of the standing forest volume. This thesis presents results from four studies (papers I - IV), with the aim to increase the level of knowledge about establishment and regeneration of birch, management of naturally regenerated birch in pure and mixed stands, and the distribution of birch over Sweden. The studies were based on experimental data from field trials, survey data from practical forestry, Swedish national forest inventory data and predictive modelling. On dry soil, mechanical site preparation is necessary in order to get a successful regeneration of birch; in wet soil moisture conditions, natural regeneration of birch will appear without effort. It is possible to manage the birch regeneration success if the soil scarification is adapted to the soil moisture conditions (paper I). The proportion of silver and downy birch varied in Sweden’s young forests, and the temperature sum explained most of the variation (paper II). In dense, naturally regenerated stands of birch and Norway spruce, pre-commercial thinning (PCT) had a significant impact on the development of the future stand, and there are several profitable management strategies for the owner of this type of stand (paper III). The proportion of birch tends to decrease after canopy closure in mixtures of Norway spruce with stand age in southern Sweden, regardless of thinning (paper IV). Active forest management is key, in order to maintain the proportion of birch over the full rotation period. In conclusion, this thesis offers knowledge that can contribute to a more varied forestry, and forestry with a greater element of broadleaf trees