Feasibility of detecting single atoms using photonic bandgap cavities

We propose an atom-cavity chip that combines laser cooling and trapping of neutral atoms with magnetic microtraps and waveguides to deliver a cold atom to the mode of a fiber taper coupled photonic bandgap (PBG) cavity. The feasibility of this device for detecting single atoms is analyzed using both a semi-classical treatment and an unconditional master equation approach. Single-atom detection seems achievable in an initial experiment involving the non-deterministic delivery of weakly trapped atoms into the mode of the PBG cavity.Comment: 11 pages, 5 figure

EVALUATION OF DISTRIBUTIONAL SOLAR RADIATION PARAMETERS OF ^A^AK USING LONG-TERM MEASURED GLOBAL SOLAR RADIATION DATA

Ser bia is be com ing more dependet on im ported pri mary en ergy to meet its in creas ing en ergy de mand. The ra tio of in dig e nous pri mary en ergy pro duc-tion to pri mary en ergy con sump tion is de creas ing. There fore, it is of great im por tance for Ser bia to make use of its in dig e nous en ergy re sources more ef fec tively, in clud ing its so lar en ergy po ten tial. Knowl edge of global so lar ra di a tion is es sen tial in the pre dic tion, study, and de sign of the eco nomic vi-a bil ity of sys tems which use so lar en ergy. In this pa per, the so lar ra di a tion data on ^a~ak (lat 43.87 ° N, long 20.33° E) are an a lyzed based on 4 years of global so lar ra di a tion data mea sured on a hor i zon tal sur face. The dis tri bu tional so lar ra di a tion pa ram e ters are de rived from the avail able data and an a lyzed. The avail able so lar ra di a tion data on a hor i zon tal sur face are con verted to that of var i ous tilt an gles and the yearly and monthly op ti mum tilt an gles are de ter mined. Key words: renewable energy, solar radiation, optimal tilt angl

THE INCIDENCE OF ANEMIA IN THE ADULT WORKING POPULATION OF VOJVODINA U^ESTALOST ANEMIJE ME\U ODRASLIM RADNO AKTIVNIM OSOBAMA U VOJVODINI

Summary Background: Anemia is a global public health problem of endemic proportions, especially in women, and with serious health consequences. Anemia was defined according to the World Health Organization criteria as hemoglobin concentration <130 g/L for men and <120 g/L for women. The incidence of anemia varies between regions, so the aim of the study was to determine the incidence of anemia in a randomly selected sample of adult working individuals of both sexes, in Vojvodina. Methods: The study included a total of 6087 subjects (4658 men and 1429 non-pregnant women) aged 18-65 years who presented for a regular checkup at the Public Health Institute of Vojvodina. Blood specimen collection was performed by antecubital venipuncture in all subjects. Results: The results showed that the incidence of anemia in adults in Vojvodina was 7.7%, and it was more frequent in women (20%) than in men (3.86%). The most frequent was normocytic anemia, whereas microcytic anemia was less prevalent. Macrocytic anemia was found in only 3.3% of subjects, exclusively in women. The greatest proportion of anemic subjects, regardless of sex, had hemoglobin levels that indicated mild anemia (Hb 100 -119 g/L for women, and 100-129 g/L for men). Only 4% of men and 12% of wome

Genetic optimization of photonic bandgap structures

We investigate the use of a Genetic Algorithm (GA) to design a set of photonic crystals (PCs) in one and two dimensions. Our flexible design methodology allows us to optimize PC structures which are optimized for specific objectives. In this paper, we report the results of several such GA-based PC optimizations. We show that the GA performs well even in very complex design spaces, and therefore has great potential for use as a robust design tool in present and future applications.Comment: 9 pages, 20 figure

N,N’,N”,N’”-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane and 2,6-diacetylpyridine bis(semi/thiosemicarbazones)

The preparation and characterization of Cu(II) complexes wit

Original scientific paper Synthesis of thermoplastic poly(ester-siloxane)s in the melt and in solution

Absract: Two series of thermoplastic elastomers, based on poly(dimethylsiloxane), PDMS, as the soft segment and poly(butylene terephthalate), PBT, as the hard segment, were synthesized by catalyzed transesterification, from dimethyl terephthalate, DMT, silanol-terminated poly(dimethylsiloxane), PDMS-OH, Mn = 1750 g/mol, and 1,4-butanediol, BD. The mole ratio of the starting comonomers was selected to result in a constant hard to soft weight ratio of 55:45. The first series was synthesized in order to determine the optimal mole ratio of BD and DMT for the synthesis of high molecular weight thermoplastic poly(ester-siloxane)s, TPESs. The second series was performed in the presence of the high-boiling solvent, 1,2,4-trichlorbenzene in order to increase the mixing between the extremely non-polar siloxane prepolymer and the polar reactants, DMT and BD, and, therefore, avoid phase separation during synthesis. The structure and composition of the synthesized poly(ester-siloxane)s were verified by 1H-NMR spectroscopy, while the melting temperatures and degree of crystallinity were determined by differential scanning calorimetry (DSC). The effectiveness of the incorporation of the silanol-terminated poly(dimethylsiloxane) into the polyester chains was verified by chloroform extraction. The rheological properties of the poly(ester-siloxane)s were investigated by dynamic mechanical spectroscopy (DMA)