A numerical investigation of coorbital stability and libration in three dimensions

Motivated by the dynamics of resonance capture, we study numerically the coorbital resonance for inclination180 >=I>=0 in the circular restricted three-body problem. We examine the similarities and differences between planar and three dimensional coorbital resonance capture and seek their origin in the stability of coorbital motion at arbitrary inclination. After we present stability maps of the planar prograde and retrograde coorbital resonances, we characterize the new coorbital modes in three dimensions. We see that retrograde mode I (R1) and mode II (R2) persist as we change the relative inclination, while retrograde mode III (R3) seems to exist only in the planar problem. A new coorbital mode (R4) appears in 3D which is a retrograde analogue to an horseshoe-orbit. The Kozai-Lidov resonance is active for retrograde orbits as well as prograde orbits and plays a key role in coorbital resonance capture. Stable coorbital modes exist at all inclinations, including retrograde and polar obits. This result confirms the robustness the coorbital resonance at large inclination and encourages the search for retrograde coorbital companions of the solar system's planets.Comment: accepted for publication in Celestial Mechanics and Dynamical Astronom

Method of Component Depreciation of Fixed Assetsts and Its Comparision with Traditional Methods

This contribution analyzes, based on specific examples, accounting procedures and tax implications of depreciation of tangible fixed assets. It compares the component method, which has recently appeared in the Czech legal regulations, with the traditional methods. To compare the effects that the traditional methods have on profit or loss, or rather on the tax base, also the generation of provisions is used. The use of component depreciation is governed solely by the accounting regulations while the Income Tax Act has not been changed in this respect. Profit of loss has to be adjusted by a difference amount between accounting depreciation and tax depreciation in tax return.Component depreciation, tax depreciation, accounting depreciation, profit or loss, costs, expenses, provisions., Political Economy, GA, IN,

Recent advances in 3D printing of biomaterials.

3D Printing promises to produce complex biomedical devices according to computer design using patient-specific anatomical data. Since its initial use as pre-surgical visualization models and tooling molds, 3D Printing has slowly evolved to create one-of-a-kind devices, implants, scaffolds for tissue engineering, diagnostic platforms, and drug delivery systems. Fueled by the recent explosion in public interest and access to affordable printers, there is renewed interest to combine stem cells with custom 3D scaffolds for personalized regenerative medicine. Before 3D Printing can be used routinely for the regeneration of complex tissues (e.g. bone, cartilage, muscles, vessels, nerves in the craniomaxillofacial complex), and complex organs with intricate 3D microarchitecture (e.g. liver, lymphoid organs), several technological limitations must be addressed. In this review, the major materials and technology advances within the last five years for each of the common 3D Printing technologies (Three Dimensional Printing, Fused Deposition Modeling, Selective Laser Sintering, Stereolithography, and 3D Plotting/Direct-Write/Bioprinting) are described. Examples are highlighted to illustrate progress of each technology in tissue engineering, and key limitations are identified to motivate future research and advance this fascinating field of advanced manufacturing

Imports , exports , and industrial performance in India , 1970-88

In the 1960's and 1970's, India's policy of encouraging self-sufficiency by restricting imports was complemented by regulation of all facets of the industrial environment. Still, India developed a large, diversified manufacturing sector. In 1977-78, the policy environment began to change - with a relaxing of import controls and restrictions that has continued until now. With reform of industrial policies and a more expansionary macroeconomic policy, the value added in manufacturing grew from 4.5 percent a year in the 1970's to 7.9 percent a year in the 1980's. Meanwhile, gradual depreciation of the currency since 1985 has encouraged exports and brought prices in India closer to world levels. The faster growth of output and productivity in the 1980's is a welcome change from India's earlier stagnation. But deteriorating macroeconomic balances have brought India to a balance of payments crisis. Changes in tariffs and other instruments have more than compensated for relaxation of the import regime. Foreign trade has contracted relative to domestic output, despite some relaxation of quantity restrictions and attempts to increase exports. The main reason for this decline has been the increase in import prices relative to domestic output because of increasing tariffs, large real devaluations (especially after 1986), and rapidly expnanding domestic demand, which have made the domestic market more attractive than exports. Policy reform has led to faster growth of manufacturing output and productivity, but the main force behind faster growth has been increased public spending fueled by growing fiscal deficits. Another important variable has been a more accommodating import policy sustained by large external borrowings. This pattern of growth is not sustainable because of significant internal and external debt stocks that have accumulated over the last decade. Macroeconomic and trade policy must change significantly to shift the economy to a more export-oriented path - both to overcome the foreign exchange shortages and to rely more on external demand for industrial output. The authors argue that the manufacturing sector is highly responsive to relative price changes. Pessimism about elasticity has pervaded Indian policy making but they show high elasticities, indicating that the economy would respond favorably to changes in incentives.Economic Theory&Research,Environmental Economics&Policies,TF054105-DONOR FUNDED OPERATION ADMINISTRATION FEE INCOME AND EXPENSE ACCOUNT,Consumption,Trade Policy

Neotropical Cerambycidae (Coleoptera) primarily in the Canadian Museum of Nature, Ottawa. I. Falsamblesthiini (Lamiinae)

The following new species are described: Nyctonympha andersoni, sp. n., and N. howdenarum, sp. n., both from Colombia; N. genieri, sp. n., from Ecuador; N. taeniata, sp. n., from Trinidad; Falsamblesthis microps, sp. n., from Venezuela; Bactriola circundata, sp. n., from Brazil (Rio de Janeiro); B. maculata, sp. n., from Venezuela and Ecuador; and B. falsa, sp. n., from Brazil (Minas Gerais to Rio Grande do Sul). A redescription of Bactriola vittulata Bates, 1886, herein designated as the type species of the genus, is provided. Accurate data on the occurrence of Saepiseuthes chilensis Thomson, 1868, in Chile are given. Keys to the species of Bactriola Bates, 1886 and Nyctonympha Thomson, 1868 are added

Optimal control of a dengue epidemic model with vaccination

We present a SIR+ASI epidemic model to describe the interaction between human and dengue fever mosquito populations. A control strategy in the form of vaccination, to decrease the number of infected individuals, is used. An optimal control approach is applied in order to find the best way to fight the disease.Comment: This is a preprint of a paper accepted for presentation at ICNAAM 2011, Halkidiki, Greece, 19-25 September 2011, and to appear in AIP Conference Proceedings, volume 138

Modeling and Optimal Control Applied to a Vector Borne Disease

A model with six mutually-exclusive compartments related to Dengue disease is presented. In this model there are three vector control tools: insecticides (larvicide and adulticide) and mechanical control. The problem is studied using an Optimal Control (OC) approach. The human data for the model is based on the Cape Verde Dengue outbreak. Some control measures are simulated and their consequences analyzed