http://hdl.handle.net/123456789/6 Contains full text theses. 2013-06-14T00:01:00Z http://hdl.handle.net/1993/21682 Title: Responses of Aleochara bilineata Gyllenhal and Aleochara bipustulata (L.) (Coleoptera: Staphylinidae) to dimethyl disulphide Authors: Du, Jing Jr Abstract: Aleochara bilineata and Aleochara bipustulata are staphylinid beetles that are attracted to pitfall traps baited with dimethyl disulphide (DMDS), but the role of DMDS in their biology has not been elucidated. In still air, first instar larvae of both Aleochara species exhibited area-restricted movement when they came near to DMDS. DMDS increased the frequency of parasitism of D. radicum puparia, the preferred host, but the frequency of attacks on unpreferred piophilid puparia was not affected by DMDS. In still air, adult A. bilineata and A. bipustulata distribution was not consistently influenced by DMDS. In a Y-tube olfactometer, newly-emerged females of both species avoided DMDS-laden air; after 10 days mated females chose air with DMDS. Newly emerged males also avoided DMDS, but after 10 days mated males neither avoided nor selected DMDS-laden air: the shift in response was associated with mating status rather than age. 2013-06-13T00:00:00Z http://hdl.handle.net/1993/21681 Title: A model for time-independent and time-dependent damage evolution and their influence on creep of multidirectional Polymer composite laminates Authors: Asadi, Amir Abstract: Application of polymer matrix composites in engineering structures has been steadily increasing over the past five decades. Multidirectional polymer composites are one class of continuous fiber reinforced polymer matrix composites used in aerospace structures, where the desired mechanical performance outweighs the cost. Their modulus and strength degrade with time (known as creep and creep rupture) during the service, owing to the viscos-elasticity of the polymer matrix. Additional contribution to this degradation comes from various damage modes developed in the plies of the composite with time and identified in this thesis as TDD (Time Dependent Damage). These damage modes may also develop due to process-induced residual stresses, and during loading to the service load, identified as TID (Time Independent Damage). TID influences the TDD, the creep and the creep rupture. The objective of this thesis is to develop a model to predict the evolution of TID and TDD in multiple plies of a laminate and their influence on creep. The predominant damage mode, transverse cracking, is modeled in this study. The model consists of four modules, PIS, QSL, SL, and VA. The PIS, QSL, and SL moduli predict changes in ply stresses for incremental change in temperature, stress, and time respectively, using lamination theory and assuming linear elastic behavior of the plies during an incremental step. In parallel, each module predicts the stored elastic energy in each ply after each incremental step and compares it with a critical stored elastic energy criterion to determine if a ply would crack. If fracture is predicted, the VA module based on variational analysis, is invoked to determine the crack density and the perturbation in ply stresses due to cracking. The perturbation stresses are used by the module that invoked the VA module to determine the ply stresses after cracking during the current incremental step. The model predictions for a [±45/90]s laminate, at two test temperatures (80C and 180C) and four stresses in the range of 20–54 MPa, compare very well with experimental results validating the model. 2013-06-10T00:00:00Z http://hdl.handle.net/1993/21680 Title: Sensor agnostic and communication independent SCADA Authors: Naigeboren, Gustavo Ariel. Abstract: 0201-01-01T00:00:00Z http://hdl.handle.net/1993/21678 Title: QoS-constrained information theoretic capacity maximization in CDMA systems Authors: Abadpour, Arash. Abstract: 2010-01-01T00:00:00Z