A participatory rural appraisal inthree West African countries examined thepossibility for replacing chemical pesticidesto control locusts and grasshoppers with abiological control method based on anindigenous fungal pathogen. The fungus iscurrently being tested at different sites inthe Sahel and in the humid tropics of WestAfrica. Structured group interviews, individualdiscussions, and field visits, were used toobtain farmers' perceptions of locust andgrasshoppers as crop pests, their quantitativeestimation of crop losses, and theirwillingness to pay for locust control. Farmersas well as plant protection officers generallyperceived (...) locusts and grasshoppers as importantpests that cause significant damage. Farmerswere aware of some of the risks of the use ofchemical pesticides, but not of the potentialalternatives. The use of the fungus in anoil-formulation and standard Ultra Low Volume(ULV) equipment was demonstrated, and theresults discussed with farmers. Theirimpressions of biological control werefavorable, and they expressed an interest inusing the technology. Farmers' expressedwillingness to pay for locust control is small,but not negligible. Locusts and grasshoppersare very visible pests and thus amenable topressure from farmers to local administrators,as well as by farmers' relatives in the city onthe national government. Therefore, politicalpressure for locust control is strong, althoughnational governments spend little on it,depending mostly on foreign donors. Donors areincreasingly worried about the environmentaleffect of the large amounts of chemicalpesticides used on locust control, and arepushing for more benign alternatives. Theresults of the present survey indicate thatthere may be a potential market for abiopesticide against grasshoppers and locustson cash crops in the humid areas. The potentialmarket in the Sahel depends on a reduction ofcosts or a subsidy of its price. This subsidycould be justified by the expected reduction inenvironmental and health costs when replacingchemical pesticides. Since donors are thecurrent purchasers of chemical pesticides forthe Sahel, they would also be expected to beinvolved in the purchase of the biologicalproduct. (shrink)
We present a novel spontaneous collapse model where size is no longer the property of a physical system which determines its rate of collapse. Instead, we argue that the rate of spontaneous localization should depend on a system’s quantum Integrated Information, a novel physical property which describes a system’s capacity to act like a quantum observer. We introduce quantum Integrated Information, present our QII collapse model and briefly explain how it may be experimentally tested against quantum theory.
The rationalization of context-based choice is usually based on the assumption that preferences are context-dependent. In this paper, we show that context-based choice can be due to the characteristics of the choice procedure applied by the individual and not to the dependence of preferences (stochastic or deterministic) on the context. Our arguments are illustrated focusing on the much-studied dominated-alternative effects.
In this article I offer a way of interpreting Richard Rorty's political suggestions. I believe Rorty's lack of offering concrete proposals for dealing with the usual key problems of liberalism is deliberate. I look at this lack from a generous point of view and claim that what Rorty offers us is another kind of political intentionality. As a pragmatist, Rorty does not look for a foundational way of justifying things but, instead, searches for a description that makes liberalism an attractive (...) practice. Following Gadamer and Rorty, I intend looking at liberalism as a kind of game and a public lifestyle. I claim that such a prior understanding illuminates and articulates liberal key terms such as: freedoms, public sphere, respecting the other. (shrink)
In this paper, the Helmholtz equation with quadratic damping themes is used for modeling the dynamics of a simple prey-predator system also called a simple Lotka–Volterra system. From the Helmholtz equation with quadratic damping themes obtained after modeling, the equilibrium points have been found, and their stability has been analyzed. Subsequently, the harmonic oscillations have been studied by the harmonic balance method, and the phenomena of resonance and hysteresis are observed. The primary and secondary resonances have been researched by the (...) multiple-scale method, and the conditions of stability of the amplitudes of oscillations are determined. Chaos is detected analytically by the Melnikov method and numerically using the basin of attraction, the bifurcation diagram, the Lyapunov exponent, the phase portrait, and the Poincaré section. The effects of all the parameters of the system are analyzed in detail, and special emphasis is placed on the new parameters. Through this analysis, the complex phenomena such as hysteresis, bistability, amplitude jump, resonances, and chaos have been obtained. The control of the parameters and the necessary conditions to control the aforementioned phenomena have been found. (shrink)
This paper deals with the effects of an amplitude-modulated excitation on the nonlinear dynamics of reactions between four molecules. The computation of the fixed points of the autonomous nonlinear chemical system has been made in detail using the Cardan’s method. Hopf bifurcation has been also successfully checked. Routes to chaos have been investigated through bifurcations structures, Lyapunov exponent, phase portraits, and Poincaré section. The effects of the control force on chaotic motions have been strongly analyzed, and the control efficiency is (...) found in the cases g=0 and g≠0 with Ω=ω and Ω/w≠p/q; p and q are simple positive integers. Vibrational resonance, hysteresis, and coexistence of several attractors have been studied in detail based on the relationship between the frequencies of the AM force. Results of analytical investigations are validated and complemented by numerical simulations. (shrink)
Her heart shared between Iran and Italy, while Asma Mehan makes peace with lockdown in her current home in Porto, Portugal, her thoughts stray to those familiar places. In those distant horizons there is heartache, but also the unexpected promise of different futures.
The volume gathers eleven studies on the intellectual exchanges during the Middle Ages among the three cultures which existed side by side in the same geographical area, i.e. the vast space from the British Isles to the Sahara Desert, and from the Douro Valley to the Hindu Kush. These three cultures – who may not be reduced to their confession or ethnicity – are historically related to each other in many respects, both material (trade, wars, marriages) and immaterial (the (...) interdependence among their religious narratives and their philosophical speculations). The studies herein presented focus on some peculiar examples of the transcultural interactions among exponents of the Arabic, Hebrew and Latin philosophical and theological traditions. While we do not want to downplay the fundamental role of the religious contexts, our focus on the linguistic denominations of these cultures aims at drawing attention to the conceptual medium, or rather media, which underlined and shaped the interactions and interplays among these traditions – interplays that were characterized by the contact of these three languages being used by people of different religious beliefs in their quest for knowledge: Spanish Jews writing in Arabic, Jews collaborating in the translation of Arabic texts into Latin through the vernacular, Western Muslims whose writings were read mainly by Jews and Christians in Hebrew and Latin. (shrink)
