Overdamped dynamics of a Brownian particle levitated in a Paul trap

We study the dynamics of the center of mass of a Brownian particle levitated in a Paul trap. We focus on the overdamped regime in the context of levitodynamics, comparing theory with our numerical simulations and experimental data from a nanoparticle in a Paul trap. We provide an exact analytical solution to the stochastic equation of motion, expressions for the standard deviation of the motion, and thermalization times by using the WKB method under two different limits. Finally, we prove the power spectral density of the motion can be approximated by that of an Ornstein-Uhlenbeck process and use the found expression to calibrate the motion of a trapped particle

Las raíces de las ideas biológicas de Félix de Azara

64 páginasPeer reviewe

Los reptiles del Alto Aragón

53 páginas, 61 figurasPeer reviewe

Higher plant and vertebrate species richness in Spanish and some mediterranean mountains

10 pages.[EN] This paper reviews the biodiversity of the Spanish and some other Mediterranean mountains. These have some of the richest areas for vascular plants recorded apart from some areas in the tropics. The number of endemic species is substantial. Six areas in Spain and four other Mediterranean areas are described in detail. A special plea is made for a comprehensive detailed vegetation map for European mountains to include the Spanish and Mediterranean mountains.[FR] Ce travail porte sur la biodiversité de quelques montagnes méditerranéennes, notamment celle de l'Espagne. Ces dernières montrent une flore vasculaire des plus riches au monde, si l'on excepte les pays tropicaux. Aussi le nombre d'espèces endémiques est très important. Six systèmes montagneux d'Espagne et quatre autres sur le pourtour méditerranéen sont étudiés en détail. Dans une section spéciale on étudie la carte de végétation synthétique des montagnes européennes, de façon à inclure les montagnes de l'Espagne et de la Méditerranée.[ES] Se estudia la biodiversidad de las montañas españolas y de otras mediterráneas. Si se exceptúan algunas áreas tropicales, se trata de una de las áreas más ricas en plantas vasculares. El número de especies endémicas resulta sustancial. Se estudian con mayor detalle seis áreas montañosas de España y cuatro áreas más del Mediterráneo. De un modo particular se estudia un mapa sintético de vegetación de las montañas de Europa en relación con las montañas de España y del Mediterráneo.Peer reviewe

Los anfibios del Alto Aragón: un ensayo de Corología

41 páginasPeer reviewe

A Job Training Report as a Staff of the International Cooperation Sub Division at Surabaya City Government

As the second largest city in Indonesia. Surabaya has the important roles to develop the country, especially in the economic sector. In order to make Surabaya better, Surabaya City Government established Cooperation Division. The division has the duty to facilitate cooperation between Surabaya City. Government and various parties, such as institutions, schools, universities, organization and other groups both domestic and foreign cities

Binary Collisions and the Slingshot Effect

We derive the equations for the gravity assist manoeuvre in the general 2D case without the constraints of circular planetary orbits or widely different masses as assumed by Broucke, and obtain the slingshot conditions and maximum energy gain for arbitrary mass ratios of two colliding rigid bodies. Using the geometric view developed in an earlier paper by the authors the possible trajectories are computed for both attractive or repulsive interactions yielding a further insight on the slingshot mechanics and its parametrization. The general slingshot manoeuvre for arbitrary masses is explained as a particular case of the possible outcomes of attractive or repulsive binary collisions, and the correlation between asymptotic information and orbital parameters is obtained in general.Comment: 12 pages, 7 figures, accepted for publication Dec'07, Celestial Mechanics and Dynamical Astronom

Perbedaan Konsentrasigaramterhadap Pembentukan Warna Terasi Udang Rebon (Acetes SP.) Basah

Terasi merupakan salah satu produk fermentasi berbahan baku udang rebon, ikan atau keduanya. Pengolahannya dilakukan dengan cara menambahkan garam dan difermentasi pada suhu tertentu selama beberapa waktu. Terasi udang umumnya berwarna merah. Warna tersebut merupakan salah satu daya tarik konsumen. Pembentukan warna merah terasi dipengaruhi oleh pigmen astaxanthin. Penelitian ini bertujuan untuk mengetahui pengaruh garam (2%; 8,5%; 15%) terhadap pembentukan warna terasi. Rancangan penelitian ini menggunakan pola percobaan Rancangan Acak Lengkap dengan tiga kali ulangan. Parameter uji yang dilakukan adalah uji kadar garam, Aw, astaxanthin, warna, dan organoleptik.Hasil penelitian diketahui bahwa proses pengolahan terasi udang dengan konsentrasi garam berbeda berpengaruh terhadap nilai kadar garam, Aw, astaxanthin, dan warna. Nilai kadar garam terasi udang berkisar antara 0,67 – 1,56% dan nilai Aw antara 0,78 – 0,74. Terasi udang dengan garam 2%; 8,5%; dan 15% memiliki nilai astaxanthin berturut-turut 6,0 mg/100g, 4,5 mg/100g, dan 2,4 mg/100g. Berdasarkan nilai a* dan b* dapat dihitung ohue dan diketahui terasi dengan garam 2% memiliki warna merah kekuningan sedangkan terasi dengan garam 8,5% dan 15% memiliki warna merah. Terasidenganpenambahangaram 15% merupakan terasi dengan kenampakan terbaik