Chemical Control of Woody Plants

Many woody plants are problems in rangeland, along roadsides, under utility lines, and along irrigation and drainage ditches. It is often desirable to control these plants on rights-of-way, but it is advisable to study the situation before controlling them on rangeland. Chemicals used to control undesirable woody species may also kill desirable range £orbs and woody plants. One should be certain that the range forage will be improved before he does any large-scale spraying. It may be advisable to conduct a few small-area trials before the entire range is treated. To make spraying pay on rangeland it is desirable to follow good range management so that grasses will take over as the woody plants die out. Even though the grasses are present, they will not spread after the woody plants have been killed except under light grazing or no grazing conditions. Many of the grass plants should be allowed to produce seed. In South Dakota research has been limited to the use of chemicals for the control of buckbrush, sagebrush and poison ivy. Therefore, most of the information presented was obtained from the North Central Weed Control Conference and from states that have more woody plant problems than South Dakota. Most of the suggestions offered here have not been tried extensively in South Dakota, but they have proved to be satisfactory under similar conditions

Thinning Black Hills Pine

Guide to thinning Black Hills pine trees to eliminate the least productive, low quality trees giving room to remaining trees and increased rate of growth. Discusses are reason not to clear-cut, types of thinning, spacing guides, slash disposal, equipment needed, and government cost-share programs

Cutting Posts and Poles for Profit

Guide to cutting posts and poles for profit discusses thinning a timber stand and how to cut an acceptable product

Cutting Posts and Poles for Profit

This publication provides guidance on harvesting timber for posts and poles. It includes suggestions to check with the farm forester for technical assistance, secure a market for the product before cutting, cut the post to the proper length with square-cut ends, and limb smoothly

Pruning Black Hills Pine

Guide to pruning Black Hills pine addresses selecting crop trees, equipment needed for pruning, safety, and government cost-share

Quantum Scattering in Two Black Hole Moduli Space

We discuss the quantum scattering process in the moduli space consisting of two maximally charged dilaton black holes. The black hole moduli space geometry has different structures for arbitrary dimensions and various values of dilaton coupling. We study the quantum effects of the different moduli space geometries with scattering process. Then, it is found that there is a resonance state on certain moduli spaces.Comment: 15 pages, 19 figures, RevTeX 3.

Variation of the Fine-Structure Constant and Laser Cooling of Atomic Dysprosium

Radio-frequency electric-dipole transitions between nearly degenerate, opposite parity levels of atomic dysprosium (Dy) were monitored over an eight-month period to search for a variation in the fine-structure constant, $\alpha$. The data provide a rate of fractional temporal variation of $\alpha$ of $(-2.4\pm2.3)\times10^{-15}$ yr$^{-1}$ or a value of $(-7.8 \pm 5.9) \times 10^{-6}$ for $k_\alpha$, the variation coefficient for $\alpha$ in a changing gravitational potential. All results indicate the absence of significant variation at the present level of sensitivity. We also present initial results on laser cooling of an atomic beam of dysprosium.Comment: 10 pages, 6 figures, fixed typos in section 5, updated result

Frequency Dependent Viscosity Near the Critical Point: The Scale to Two Loop Order

The recent accurate measurements of Berg, Moldover and Zimmerli of the viscoelastic effect near the critical point of xenon has shown that the scale factor involved in the frequency scaling is about twice the scale factor obtained theoretically. We show that this discrepancy is a consequence of using first order perturbation theory. Including two loop contribution goes a long way towards removing the discrepancy.Comment: No of pages:7,Submitted to PR-E(Rapid Communication),No of EPS files:

Investigation of the Gravitational Potential Dependence of the Fine-Structure Constant Using Atomic Dysprosium

Radio-frequency E1 transitions between nearly degenerate, opposite parity levels of atomic dysprosium were monitored over an eight month period to search for a variation in the fine-structure constant. During this time period, data were taken at different points in the gravitational potential of the Sun. The data are fitted to the variation in the gravitational potential yielding a value of $(-8.7 \pm 6.6) \times 10^{-6}$ for the fit parameter $k_\alpha$. This value gives the current best laboratory limit. In addition, our value of $k_{\alpha}$ combined with other experimental constraints is used to extract the first limits on k_e and k_q. These coefficients characterize the variation of m_e/m_p and m_q/m_p in a changing gravitational potential, where m_e, m_p, and m_q are electron, proton, and quark masses. The results are $k_e = (4.9 \pm 3.9) \times 10^{-5}$ and $k_q = (6.6 \pm 5.2) \times 10^{-5}$.Comment: 6 pages, 3 figure