One of the interesing tunneling phenomena is negative differential resistance (NDR), the basic principle of resonant-tunneling diodes. NDR has been utilized in various semiconductor devices such as frequency multipliers, oscillators, relfection amplifiers, logic switches, and memories. The NDR in graphene has been also reported theoretically as well as experimentally, but should be further stud...

OBJECTIVE To study the applicability of the Strength and Difficulties Questionnaire (SDQ 2,4-p) as a screening tool for mental health problems in preschoolers, in the context of Primary Health Care; to evaluate the mental health problems of the sample, comparing data from SDQ (2,4-p) and from the Child Behavior Check List (CBCL 1½-5 years). METHODS Cross-sectional observational study with a c...

mRNA localization pathways play a central role in axis determination in Drosophila (St Johnson and NussleinVolhard, 1992). The posterior axis of the embryo is specified by a Nanos (Nos) protein gradient, which is generated from the translation of nos mRNA anchored at the posterior pole (Lasko, 1999). nos mRNA is localized at the pole during oogenesis by a mechanism that depends upon the oskar (...

A method for constructing semianalytical strongly correlated wavefunctions for single and molecular quantum dots (QDs) is presented. It employs a two-step approach of symmetry breaking at the Hartree–Fock level and of subsequent restoration of total spin and angular momentum symmetries via projection techniques. Illustrative applications are presented for the case of a two-electron helium-like ...

15 16 Running title: Gene exchange shaping variation 17 Word count (main text): 5709 18 19 2 Gene flow (defined as allele exchange between populations) and gene flux (defined as 20 allele exchange during meiosis in heterokaryotypic females) are important factors 21 decreasing genetic differentiation between populations and inversions. Many 22 chromosomal inversions are under strong selection an...

We discuss the possibility of measuring particle-antiparticle mixing using toponium bound states where the top quark t (or Z) decays weakly. It is suggested to detect B” Do mixing via events having three leptons of the same charge in the final state. Such a signature could lead to samples with a very low background. Estimations are given for an e+eexperiment of 200 pb-l assuming that the toponi...

since hydrocarbon sources have an important role in development of industry and technology, exploration of them has been lionized by human. the seismic reflection method is one of the most applicable investigative methods to identify the hydrocarbon reservoirs, but in some cases this method does not work well because of geology conditions and wave attenuation in depth. thus, some exploration me...

Lo~v noisc prealnplifiers are requircd for the dcrcctio~\ of the magnclic rcson;nicc of s~ii:~ll size samplcs o r a l low tnagnetic fields. According to calculat~ons based on the "ell. ill " modcl. SQUID b;tscd nnlplifiers arc more suitable to NMR experiments on sn~all samplcs lhan sciniconductor amplifiers. We propose an amplification method by frequency transposition using a DC SQUID. Such a ...