Effects of inter-varietal diversity, biotic stresses and environmental productivity on grain yield of spring barley variety mixtures

Varietal seed mixtures tend to increase and stabilize crop yields, yet their application is sparse. Large-scale cultivation of variety mixtures may require a better understanding of how inter-varietal interactions and their interaction with the environment may influence the grain yield of variety mixtures relative to their component varieties. For this purpose, six variety mixtures of spring barley and 14 component varieties were grown in each of 17 trial environments. A total of 28 observed and a priori plant characteristics, including grain yield, disease severity and weed competitiveness, were derived for each component variety in each trial. The relationship between inter-varietal diversity of each characteristic and the mixing effect on grain yield was analysed. Additionally, various types of yield stability were estimated and compared among mixtures and component varieties. One mixture out-yielded all of its component varieties in almost half of the trial environments. Inter-varietal diversity in grain yield potential correlated significantly with mixing effect, as did straw length diversity when weighted with weed pressure. The grain yields of most mixtures were more stable across environments than their component varieties when accounting also for the general response to environmental productivity. Hence, most mixtures adapted slightly better to environmental productivity and were less sensitive to environmental stress than their component varieties. We conclude that the efficacy of variety mixtures may be enhanced by mixing relatively high-yielding varieties differing in responsiveness to environmental productivity

IPAD: Integrated Programs for Aerospace-vehicle Design

Early work was performed to apply data base technology in support of the management of engineering data in the design and manufacturing environments. The principal objective of the IPAD project is to develop a computer software system for use in the design of aerospace vehicles. Two prototype systems are created for this purpose. Relational Information Manager (RIM) is a successful commercial product. The IPAD Information Processor (IPIP), a much more sophisticated system, is still under development

DaSSFNet: An Extension to DaSSF for High-Performance Network Modeling

Scalable Simulation Framework (SSF) is a discrete-event simulation framework providing a unified programming interface geared towards network simulation. Dartmouth SSF (DaSSF) is a C++ implementation of SSF, designed for simulating very large-scale multi-protocol communication networks. As of the latest release, DaSSF lacks many features present in SSF and this prevents it from achieving mainstream use. To alleviate this shortcoming we designed and implemented DaSSFNet which extends DaSSF to the levels of functionality found in SSF. In this paper, we show that DaSSFNet and SSFNet are identical in operation given the same input. We also show that DaSSFNet is about twice as fast and has one third the memory consumption of SSFNet when simulating identical networks. Therefore, we argue, that the DaSSF simulation package with DaSSFNet now offers a viable alternative to SSF in high-performance network simulation

A Domain-Specific Conceptual Query System

This thesis presents the architecture and implementation of a query system resulted from a domain-specific conceptual data modeling and querying methodology. The query system is built for a high level conceptual query language that supports dynamically user-defined domain-specific functions and application-specific functions. It is DBMS-independent and can be translated to SQL and OQL through a normal form. Currently, it has been implemented in neuroscience domain and can be applied to any other domain

Comparative Study between Relational Database System (RDBMS) and Object Relational Database System (ORDBMS) in Data Modelling and Database Languages

This paper presents comparative study between Relational Database Management System (RDBMS) and Object Relational Database Management System(ORDBMS). The objective are to develop two systems with different models; Relational Database Management System (RDBMS) and Object-Relational Database Management System (ORDBMS) and also to choose which model is better from user and designer's point of view in terms of data modeling. Several problems are being identified in order to know which model is better; Relational Database Model or Object-Relational Database. Model approach. Similarities and differences between the two models based on criteria such as data modeling are compared. This is to provide guidelines on which model users or designers to choose from based on different type of data that they wish to accommodate. The scope of research is limited to be on the development of RDBMS and ORDBMS. This project involves project planning, requirements gathering, requirements analysis, logical database design, physical database design and finally testing phase. Thus, for the data collection, a research and a survey has been conducted through readings and interviews. By developing this comparative study, this project is expected to be implemented in Admission and Registration Unit in which it can serve the better performance of database

Database Design and Implementation

The book of Database Design and Implementation is a comprehensive guide that provides a thorough introduction to the principles, concepts, and best practices of database design and implementation. It covers the essential topics required to design, develop, and manage a database system, including data modeling, database normalization, SQL programming, and database administration. The book is designed for students, database administrators, software developers, and anyone interested in learning how to design and implement a database system. It provides a step-by-step approach to database design and implementation, with clear explanations and practical examples. It also includes exercises and quizzes at the end of each chapter to help reinforce the concepts covered. The book begins by introducing the fundamental concepts of database systems and data modeling. It then discusses the process of database design and normalization, which is essential for creating a well-structured and efficient database system. The book also covers SQL programming, which is used for querying, updating, and managing data in a database. Additionally, it includes a comprehensive discussion on database administration, including security, backup and recovery, and performance tuning.https://orc.library.atu.edu/atu_oer/1002/thumbnail.jp

DLI-2: Creating the Digital Music Library: Final Report to the National Science Foundation

Indiana University’s Variations2 Digital Music Library project focused on three chief areas of research and development: system architecture, including content representation and metadata standards; component-based application architecture; and network services. We tested and evaluated commercial technologies, primarily for multimedia and storage management; developed custom software solutions for the needs of the music library community; integrated commercial and custom software products; and tested and evaluated prototype systems for music instruction and library services, locally at Indiana University, and at a number of satellite sites, in the U.S. and overseas. This document is the project's final report to the National Science Foundation.This work was sponsored by the National Science Foundation under award no. 9909068, as part of the DLI-2 initiative