Harvester Crane Key Parameters:Optimization in European Russian Pines

The purpose of this study is to find out the effect of using the multiobjective simulation technique for logging technology and machinery optimal design. This topic was identified as important to support forest machinery designers in providing them with the necessary knowledge for carrying out the first drafts without a pilot machinery model. The method is applied to pines growing in the Russian North-West region

Thinning Regime Optimization in European Russian Pines

One part of the procedure for improvement of machinery performance criteria is a multi-objective algorithm for thinning regime optimization. A "relative centre mass" method is used as its basis with relative unit harvesting cost and total and/or merchantable (intermediate and final) cutting volume criteria. The problem of optimum density over time for even-aged, one-species stands is formulated as a nonlinear programming task. The number of cuttings, the intensity of the thinning, and the thinning intervals are defined simultaneously using a "random search" algorithm. The method is applied to pine stands growing in the Russian Northwest region

Forest Machinery Crane Compound Scheme Synthesis: "Skeleton" Part

The optimal model for a hydraulic crane compound scheme is discussed for four types of mobile logging machines: secondary transport truck or lorry, skidder (feller-skidder), forwarder, and harvester (feller-buncher)

Spin Polarisability of the Nucleon in the Heavy Baryon Effective Field Theory

We have constructed a heavy baryon effective field theory with photon as an external field in accordance with the symmetry requirements similar to the heavy quark effective field theory. By treating the heavy baryon and anti-baryon equally on the same footing in the effective field theory, we have calculated the spin polarisabilities $\gamma_i, i=1...4$ of the nucleon at third order and at fourth-order of the spin-dependent Compton scattering. At leading order (LO), our results agree with the corresponding results of the heavy baryon chiral perturbation theory, at the next-to-leading order(NLO) the results show a large correction to the ones in the heavy baryon chiral perturbation theory due to baryon-antibaryon coupling terms. The low energy theorem is satisfied both at LO and at NLO. The contributions arising from the heavy baryon-antibaryon vertex were found to be significant and the results of the polarisabilities obtained from our theory is much closer to the experimental data.Comment: 21pages, title changed, minimal correction