Effect of White Spruce Release on Subsequent Defoliation by the Yellowheaded Spruce Sawfly, Pikonema Alaskensis (Hymenoptera: Tenthredinidae)

Hand release of 22 5-year-old white spruce, Picea glauca (Moench) Voss, dramatically increased the amount of defoliation by the yellowheaded spruce sawfly, Pikonema alaskens is . The percent defoliation of the released trees was six times the defoliation in the control trees. A light overstory for young white spruce is suggested as a silvicultural method of reducing defoliation by this sawfly

Do We Need to Put God into Emotional Support?: A Comparison of Caucasians’ and African-Americans’ Evaluations of Religious versus Non-Religious Comforting Messages

The current study explored whether ethnicity influences young adults’ evaluations of two different sets of comforting messages: those in which concepts such as God, prayer, religion, and faith are woven into low, moderate, and high person-centered strategies (called ‘‘religious strategies’’) and those in which such concepts are not embedded (called ‘‘non-religious strategies’’) into the messages. One hundred ninety-seven college students (63% African-American; 37% Caucasian) rated the sensitivity and effectiveness of religious and non-religious comforting messages. Several significant differences were observed between Caucasians and African-Americans in their evaluations of these strategies. Findings are discussed in terms of their practical implications for ‘‘real world’’ comforting efforts as well as the theoretical significance they hold for the concept of person-centeredness

Combustion of hydrogen-air jets in local chemical equilibrium: A guide to the CHARNAL computer program

A guide to a computer program, written in FORTRAN 4, for predicting the flow properties of turbulent mixing with combustion of a circular jet of hydrogen into a co-flowing stream of air is presented. The program, which is based upon the Imperial College group's PASSA series, solves differential equations for diffusion and dissipation of turbulent kinetic energy and also of the R.M.S. fluctuation of hydrogen concentration. The effective turbulent viscosity for use in the shear stress equation is computed. Chemical equilibrium is assumed throughout the flow

Learning from lesbian non-gestational parents : contributions to a changing world

This qualitative study explored narratives of lesbian non-gestational parents as they reflected on how they planned the stages of building a family, experienced their partner\u27s pregnancy, and adapted to parenthood. The study delved into issues of personal and social identity as these shifted during this important period in family life. The present inquiry contributes to our gaps in knowledge about how planned lesbian-led families take shape and specifically about the experiences of non-gestational parents as they engage in each stage from lesbian partner to lesbian parent. This study examines ways how non-gestational parents cultivate their family roles, explores considerations of donor characteristics or traits, and describes ways the donor stories are then narrated in family histories. The investigation illuminates non-gestational parent\u27s beliefs about changes in personal and social identity during her partner\u27s pregnancy, perceptions of parent / infant bonding, and strategies for negotiating a satisfying parent role. The sample was comprised of 13 lesbian non-gestational parents with children aged 14 years or younger. Results indicated that most women who take the non-gestational role feel some measure of invisibility particularly during their partner\u27s pregnancy and also, face the challenge of crafting an identity barely recognized in a heteronormative culture. The data gathered for this study shows that the more prepared non-gestational parents are for the demands of forging a new family role outside the norm and the more strategic and intentional the parents\u27 partnership in creating a family, the more satisfied these parents were within their social contexts and in their bonded and unique relationship to their children and their partners

Stringent limitations on reductive perturbation studies of nonplanar acoustic solitons in plasmas

More than fifty years ago, the Korteweg-de Vries equation was shown to describe not only solitary surface waves on shallow water, but also nonlinear ion-acoustic waves. Because of the algorithmic ease of using reductive perturbation theory, intensive research followed on a wide range of wave types. Soon, the formalism was extended to nonplanar modes by introducing a stretching designed to accommodate spherically and cylindrically symmetric ion-acoustic waves. Over the last two decades many authors followed this approach, but almost all have ignored the severe restrictions in parameter space imposed by the Ansatz. In addition, for other steps in the formalism, the justification is often not spelled out, leading to effects that are physically undesirable or ambiguous. Hence, there is a need to critically assess this approach to nonplanar modes and to use it with the utmost care, respecting the restrictions on its validity. Only inward propagation may be meaningfully studied and respect for weak nonlinearities of at most 1/10 implies that one cannot get closer to the axis or centre of symmetry than about 30 Debye lengths. Thus, one is in a regime where the modes are quasi-planar and not particularly interesting. Most papers disregard these constraints and hence reach questionable conclusions

Shock propagation and stability in causal dissipative hydrodynamics

We studied the shock propagation and its stability with the causal dissipative hydrodynamics in 1+1 dimensional systems. We show that the presence of the usual viscosity is not enough to stabilize the solution. This problem is solved by introducing an additional viscosity which is related to the coarse-graining scale of the theory.Comment: 14 pages, 16 figure

Magnetic Helicity in Sphaleron Debris

We develop an analytical technique to evaluate the magnetic helicity in the debris from sphaleron decay. We show that baryon number production leads to left-handed magnetic fields, and that the magnetic helicity is conserved at late times. Our analysis explicitly demonstrates the connection between sphaleron-mediated cosmic baryogenesis and cosmic magnetogenesis.Comment: 9 pages, 1 figure. v2: Minor revisions; matches published version in Physical Review

Anomalous fluctuations of active polar filaments

Using a simple model, we study the fluctuating dynamics of inextensible, semiflexible polar filaments interacting with active and directed force generating centres such as molecular motors. Taking into account the fact that the activity occurs on time-scales comparable to the filament relaxation time, we obtain some unexpected differences between both the steady-state and dynamical behaviour of active as compared to passive filaments. For the statics, the filaments have a {novel} length-scale dependent rigidity. Dynamically, we find strongly enhanced anomalous diffusion.Comment: 5 pages, 3 figure

Ion Trap Mass Spectrometers for Identity, Abundance and Behavior of Volatiles on the Moon

NASA GSFC and The Open University (UK) are collaborating to deploy an Ion Trap Mass Spectrometer on the Moon to investigate the lunar water cycle. The ITMS is flight-proven throughthe Rosetta Philae comet lander mission. It is also being developed under ESA funding to analyse samples drilled from beneath the lunar surface on the Roscosmos Luna-27 lander (2025).Now, GSFC and OU will now develop a compact ITMS instrument to study the near-surface lunar exosphere on board a CLPS Astrobotic lander at Lacus Mortis in 2021