Rhopalum (Lathroropalum) creutzburgi spec. nov. from Nepal (Hymenoptera, Crabronidae).

Rhopalum (Latrorhopalum) creutzburgi spec. nov. aus Nepal wird beschrieben. Diagnostische Merkmale zur Abgrenzung der fünf weiteren, auf dem asiatischen Festland lebenden Arten der Untergattung Latrorhopalum Tsuneki, 1952 werden angefügt.StichwörterRhopalum, Latrorhopalum, Nepal.Nomenklatorische Handlungencreutzburgi Jacobs, 2016 (Rhopalum (Latrorhopalum)), spec. n.nursei Jacobs, 2016 (Rhopalum (Latrorhopalum)), nom. n. of Crabro petiolatus Nurse, 1902, nec Crabro petiolatus Panzer, 1797, a synonym of Mellinus crabroneus (Thunberg, 1791)Rhopalum (Latrorhopalum) creutzburgi spec. nov. from Nepal is described. Diagnostic characters for determination of the five other species inhabiting the Asian mainland are presented.KeywordsRhopalum, Latrorhopalum, Nepal.Nomenclatural Actscreutzburgi Jacobs, 2016 (Rhopalum (Latrorhopalum)), spec. n.nursei Jacobs, 2016 (Rhopalum (Latrorhopalum)), nom. n. of Crabro petiolatus Nurse, 1902, nec Crabro petiolatus Panzer, 1797, a synonym of Mellinus crabroneus (Thunberg, 1791

Dryudella paulinae spec. nov. (Hymenoptera, Crabronidae) from Morocco

Dryudella paulinae spec. nov. aus Marokko wird beschrieben. Im Bestimmungsschlüssel wird D. paulinae von anderen Dryudella-Arten unterschieden. Nomenklatorische Handlungen Dryudella paulinae spec. nov. – urn:lsid:zoobank.org:act:8D5ACFAB-85E7-422A-9956-74978BD89158Dryudella paulinae spec. nov. is described from Morocco. A concise key is presented, which differentiates D. paulinae from other Dryudella species. Nomenclatural acts Dryudella paulinae spec. nov. – urn:lsid:zoobank.org:act:8D5ACFAB-85E7-422A-9956-74978BD8915

DFS Dive-control Brakes for Gliders and Airplanes ; And, Analytical Study of the Drag of the DFS Dive-control Brake

These two reports are surveys on the progress and present state of development of dive-control flaps for gliders and airplanes. The second article describes how on the basis of wind tunnel and free-flight tests, the drag increase on brake flaps of the type DFS, can be predicted. Pressure records confirm a two-dimensional load distribution along the brake-flap surface Aerodynamically, the location of the brake flaps along the span is of importance for reasons of avoidance of vibration and oscillation phenomena on control and tail surfaces; statically, because of the magnitude of the frontal drag in diving with respect to the bending moments, which may become decisive for the dimensions of the wing attachment and for the wing covering

The Copernicus project

The Copernicus spacecraft, to be launched on May 4, 2009, is designed for scientific exploration of the planet Pluto. The main objectives of this exploration is to accurately determine the mass, density, and composition of the two bodies in the Pluto-Charon system. A further goal of the exploration is to obtain precise images of the system. The spacecraft will be designed for three axis stability control. It will use the latest technological advances to optimize the performance, reliability, and cost of the spacecraft. Due to the long duration of the mission, nominally 12.6 years, the spacecraft will be powered by a long lasting radioactive power source. Although this type of power may have some environmental drawbacks, currently it is the only available source that is suitable for this mission. The planned trajectory provides flybys of Jupiter and Saturn. These flybys provide an opportunity for scientific study of these planets in addition to Pluto. The information obtained on these flybys will supplement the data obtained by the Voyager and Galileo missions. The topics covered include: (1) scientific instrumentation; (2) mission management, planning, and costing; (3) power and propulsion system; (4) structural subsystem; (5) command, control, and communication; and (6) attitude and articulation control

Records of digger wasps from Eastern Siberia and the Far East of Russia (Hymenoptera: Sphecidae, Crabronidae)

Informationen zur Verbreitung von 17 Arten der Sphecidae und 106 Arten der Crabronidae im Osten Sibiriens werden prasentiert. Erstfunde fur Ostsibirien sind Crossocerus (Crossocerus) tarsatus (Shuckard, 1837), Diodontus handlirschi Kohl, 1888, Gorytes albidulus (Lepeletier, 1832), Gorytes procrustes Handlirsch, 1888, Nysson interruptus (Fabricius, 1798), Oxybelus haemorrhoidalis Olivier, 1812 und Pemphredon lethifer (Shuckard, 1837). Erstfund fur den Fernen Osten ist Ectemnius (Ectemnius) guttatus (Vander Linden, 1829).Information is given on the distribution of 17 species of Sphecidae and 106 species of Crabronidae in Eastern Siberia and the Russian Far East. First records for Eastern Siberia are Crossocerus (Crossocerus) tarsatus (Shuckard, 1837), Diodontus handlirschi Kohl, 1888, Gorytes albidulus (Lepeletier, 1832), Gorytes procrustes Handlirsch, 1888, Nysson interruptus (Fabricius, 1798), Oxybelus haemorrhoidalis Olivier, 1812 and Pemphredon lethifer (Shuckard, 1837). First recorded from Far East is Ectemnius (Ectemnius) guttatus (Vander Linden, 1829)

A theory of the chain melting phase transition of aqueous phospholipid dispersions

A model for the chain melting phase transition in dilute aqueous phospholipid bilayer dispersions is presented. This model includes interactions between head groups, between hydrocarbon chains, and within the chains. The head groups are modeled as hard disks which are constrained to lie on a two-dimensional surface separating the aqueous and hydrocarbon regions. The chain statistics problem is treated in an approximate manner using an approach motivated by scaled particle theory to describe the inter-chain steric repulsions in a mathematically tractable way. In this approach the whole system interacts with any given chain through an average lateral pressure which is proportional to the hard disk pressure. Following Nagle, we assume that the steric repulsions between chains and between head groups and the trans-gauche rotation energies are the dominant interactions in determining the transition and we describe the effect of the other interactions with a mean field approximation. Using the known transition temperature of a series of 1,2-diacyl phosphatidyl cholines to adjust two parameters in the theory, the model gives enthalpy and area changes that are in quite reasonable agreement with experiment. Moreover, the curvature observed in the plot of the transition temperature against acyl chain length is reproduced