Preliminary Inventory of Lepidoptera From Cook County, Minnesota: Hesperioidea, Papilionoidea, Drepanoidea, Geometroidea, Bombycoidea, Sphingoidea and Noctuoidea

Four hundred and sixty five species of butterflies, skippers and moths, collected from 1988 through the summer of 2007, are reported from Cook County, MN. Included are data for three butterfly species of special concern: Lycaeides idas nabokovi Masters, Erebia discoidalis (Kirby) and Oeneis jutta (Hübner). Numbers of species recorded for the following families were: Hesperiidae (14), Papilionidae (2), Pieridae (7), Lycaenidae (14), Nymphalidae (24), Satyridae (6), Danaidae (1), Thyatiridae (4), Drepanidae (3), Geometridae (99), Lasiocampidae (2), Saturniidae (4), Sphingidae (16), Notodontidae (20), Arctiidae (19), Lyman- triidae (5) and Noctuidae (225). Euphydryas phaeton (Drury) (Nymphalidae) is reported for the first time from Cook County, MN and Pontia protodice (Boisduval & LeConte) (Pieridae) and Hyalophora columbia (Smith) (Saturniidae) for the first time from northeastern Minnesota

Adult Trichoptera of the Devil Track River Watershed, Cook County, Minnesota and Their Role in Biomonitoring.

Thirty two light trap collections of 7,797 adult Trichoptera made from 1990-1992, show that the Devil Track River Watershed in northeast Minnesota includes at least 16 families, 41 genera, and 101 species of caddisflies including three new state records: Agyrpnia colorata, Agrypnia obsoleta, and Polycentropus glacialis. The greatest number of species were represented by the families Limnephilidae (21), Leptoceridae (19), Hydroptilidae (13), Polycentropodidae (12), nidae (10), and Hydropsychidae (9). Twenty two species were collected sites and 46 at one or two sites. The greatest number of species (81) was collected from the Devil Track River and Devil Track Lake with fewer (64 and 40) from two sites on Junco Creek. Most species are widely distributed and inhabit cool streams and lakes throughout eastern and northern North America. The high species diversity at all sites and the low number of tolerant species indicate that water quality within the watershed is good to excellent. However, increased water temperature, acidity, and/or organic enrichment could adversely affect at least one third of the Trichoptera species inhabiting the Devil Track River Watershed

Phenotypic Expression in the Paper Wasp \u3ci\u3ePolistes Fuscatus\u3c/i\u3e (Hymenoptera: Vespidae)

Quantification of color/color pattern in Polistes fuscatus (Fabricius) revealed that these attributes were the interaction of two antagonistic color sequences; their expression being highly correlated with nest microclimate (relative humidity-temperature). Color/ color pattern expressions were modified under experimental conditions to produce forms having natural counterparts in the field. Principal coordinates analyses and trend surface analyses using specimens collected throughout the United States indicated three color pattern trends, representing three distinct geographic areas, and, when objectively defined, without intergradation between and/or among areas. It was concluded that fuscatus should not be considered a widespread, polytypic species; rather, as three discrete species: an eastern, P. fuscatus (Fabricius); a western, P. aurifer Saussure; and an undescribed yellow form from the southwestern United States

Path planning for simple wheeled robots : sub-Riemannian and elastic curves on SE(2)

This paper presents a motion planning method for a simple wheeled robot in two cases: (i) where translational and rotational speeds are arbitrary and (ii) where the robot is constrained to move forwards at unit speed. The motions are generated by formulating a constrained optimal control problem on the Special Euclidean group SE(2). An application of Pontryagin’s maximum principle for arbitrary speeds yields an optimal Hamiltonian which is completely integrable in terms of Jacobi elliptic functions. In the unit speed case, the rotational velocity is described in terms of elliptic integrals and the expression for the position reduced to quadratures. Reachable sets are defined in the arbitrary speed case and a numerical plot of the time-limited reachable sets presented for the unit speed case. The resulting analytical functions for the position and orientation of the robot can be parametrically optimised to match prescribed target states within the reachable sets. The method is shown to be easily adapted to obstacle avoidance for static obstacles in a known environment

New Record of \u3ci\u3eVanessa Virginiensis\u3c/i\u3e (Drury) (Lepidoptera: Nymphalidae) as a Host of \u3ci\u3eThyrateles Procax\u3c/i\u3e (Cresson) (Hymenoptera: Ichneumonidae)

On 4 August, 2005 a male Thyrateles procax (Cresson) (Hymenoptera: Ichneumonidae) emerged from a pupa of Vanessa virginiensis (Drury) (Lepidoptera: Nymphalidae) which was contained within a screened cage in Cook County, MN. This is the first published record of Vanessa virginiensis as a host of Thyrateles procax. Adults of T. procax appear to be rare, as only two old records (both males) are known from Minnesota (University of Minnesota, Insect Collection

Attitude motion planning for a spin stabilised disk sail

While solar sails are capable of providing continuous low thrust propulsion the size and flexibility of the sail structure poses difficulties to their attitude control. Rapid slewing of the sail can cause excitation of structural modes, resulting in flexing and oscillation of the sail film and a subsequent loss of performance and decrease in controllability. Disk shaped solar sails are particularly flexible as they have no supporting structure and so these spacecraft must be spun around their major axis to stiffen the sail membrane via the centrifugal force. In addition to stiffening the structure this spin stabilisation also provides gyroscopic stiffness to disturbances, aiding the spacecraft in maintaining its desired attitude. A method is applied which generates smooth reference motions between arbitrary orientations for a spin-stabilised disk sail. The method minimises the sum square of the body rates of the spacecraft, therefore ensuring that the generated attitude slews are slow and smooth, while the spin stabilisation provides gyroscopic stiffness to disturbances. An application of Pontryagin’s maximum principle yields an optimal Hamiltonian which is completely solvable in closed form. The resulting analytical expressions are a function of several free parameters enabling parametric optimisation to be used to provide reference motions which match prescribed boundary conditions on the initial and final configurations. The generated reference motions are utilised in the repointing of a 70m radius spin-stabilised disk solar sail in a heliocentric orbit, with the aim of assessing the feasibility of the motion planning method in terms of the control torques required to track the motions

Strategy Workshops and Strategic Change

Despite the attention that strategic change as a topic of research has received, there remain considerable difficulties in conceptualizing the actual sources of strategic change. Strategy workshops represent one obvious and explicit research site since organizations often use such events as a means of effecting or initiating strategic change. This paper examines empirical data from ninety-nine strategy workshops in ten separate organizations to address the research question: Do strategy workshops produce strategic change? The paper concludes that workshops can produce change but that one-off workshops are much less effective than a series of workshops. The data presented indicates that the elapsed duration of the entire series of workshops, the frequency of workshops, the scope and autonomy of the unit concerned, and the seniority of participants have an impact on the success or failure of the venture

Grosse Ile and the Irish Memorial National Historic Site, Parks Canada: A Case Study

Focuses on values and their protection by examining the place of values in management. Grosse Ile's management is still evolving, and the eventful first phases of planning are still fresh in the minds of staff

Planning natural repointing manoeuvres for nano-spacecraft

In this paper the natural dynamics of a rigid body are exploited to plan attitude manoeuvres for a small spacecraft. By utilising the analytical solutions of the angular velocities and making use of Lax pair integration, the time evolution of the attitude of the spacecraft in a convenient quaternion form is derived. This enables repointing manoeuvres to be generated by optimising the free parameters of the analytical expressions, the initial angular velocities of the spacecraft, to match prescribed boundary conditions on the final attitude of the spacecraft. This produces reference motions which can be tracked using a simple proportional-derivative controller. The natural motions are compared in simulation to a conventional quaternion feedback controller and found to require lower accumulated torque. A simple obstacle avoidance algorithm, exploiting the analytic form of natural motions, is also described and implemented in simulation. The computational efficiency of the motion planning method is discussed

A new approach to the solution of free rigid body motion for attitude manoeuvers

A Hamiltonian formulation of free rigid body motion defined on the Special Unitary Group SU(2) is used to integrate the system to obtain a convenient quaternion representation for attitude engineering applications. Novel content of this paper concerns applying a modern approach, based on geometric control theory to obtain the kinematic solution in an elegant and compact form. Moreover, this integration leads to an attitude representation which is not Euler-angle-like, thus enhancing its applicability (e.g. to attitude motion design)