Quantum interferometry using coherent beam stimulated parametric down-conversion

We show how stimulated parametric processes can be employed in experiments on beyond the diffraction limit to overcome the problem of low visibility obtained by using spontaneous down conversion operating in the high gain regime. We further show enhancement of the count rate by several orders when stimulated parametric processes are used. Both the two photon counts and the visibility can be controlled by the phase of the stimulating coherent beam.Comment: 7 pages, 4 figure

Broken electroweak phase at high temperature in the Littlest Higgs model with T-parity

We have examined in detail the nonrestoration of symmetry at high temperature in a finite-temperature Littlest Higgs model, without and with T-parity, by evaluating the one-loop-order finite-temperature integrals of the effective potential numerically, without the high-temperature approximation, We observe that in the model without T-parity it is not possible to find a transition temperature within the allowed temperature range of the model (0<T<4f) if the UV completion factors are those which give the Standard Model electroweak minimum, as the effective potential always increases with temperature in the positive direction. However, in the case of the model with T-parity, it is possible to find a transition temperature with the same set of UV completion factors, as, with the increase of temperature, the effective potential decreases in magnitude in the positive side, becomes negative, and increases in magnitude in the negative side, indicating symmetry breaking at high temperature. This type of symmetry nonrestoration at high temperature has been observed earlier in some models involving pseudo Nambu-Goldstone bosons. The behaviour of the global structure of the effective potential with T-parity in the theory indicates a strong first order electroweak phase transition, conducive to baryogenesis in the early universe.Comment: 25 pages, 9 colour figures, references updated, explanation adde

Using a Goal-Driven Approach in the Investigation of a Questioned Contract

Part 3: FORENSIC TECHNIQUESInternational audienceThis paper presents a systematic process for describing digital forensic investigations. It focuses on forensic goals and anti-forensic obstacles and their operationalization in terms of human and software actions. The paper also demonstrates how the process can be used to capture the various forensic and anti-forensic aspects of a real-world case involving document forgery

Radix-2 x 2 x 2 algorithm for the 3-D discrete hartley transform

The discrete Hartley transform (DHT) has proved to be a valuable tool in digital signal/image processing and communications and has also attracted research interests in many multidimensional applications. Although many fast algorithms have been developed for the calculation of one- and two-dimensional (1-D and 2-D) DHT, the development of multidimensional algorithms in three and more dimensions is still unexplored and has not been given similar attention; hence, the multidimensional Hartley transform is usually calculated through the row-column approach. However, proper multidimensional algorithms can be more efficient than the row-column method and need to be developed. Therefore, it is the aim of this paper to introduce the concept and derivation of the three-dimensional (3-D) radix-2 2X 2X algorithm for fast calculation of the 3-D discrete Hartley transform. The proposed algorithm is based on the principles of the divide-and-conquer approach applied directly in 3-D. It has a simple butterfly structure and has been found to offer significant savings in arithmetic operations compared with the row-column approach based on similar algorithms

Stable Marriage with Multi-Modal Preferences

We introduce a generalized version of the famous Stable Marriage problem, now based on multi-modal preference lists. The central twist herein is to allow each agent to rank its potentially matching counterparts based on more than one "evaluation mode" (e.g., more than one criterion); thus, each agent is equipped with multiple preference lists, each ranking the counterparts in a possibly different way. We introduce and study three natural concepts of stability, investigate their mutual relations and focus on computational complexity aspects with respect to computing stable matchings in these new scenarios. Mostly encountering computational hardness (NP-hardness), we can also spot few islands of tractability and make a surprising connection to the \textsc{Graph Isomorphism} problem

Heisenberg limited Sagnac interferometry

We show how the entangled photons produced in parametric down conversion can be used to improve the sensitivity of a Sagnac interferometer. Two-photon and four-photon coincidences increases the sensitivity by a factor of two and four respectively. Our results apply to sources with arbitrary pumping and squeezing parameters.Comment: 11 pages, 5 figure

Resolution of objects within subwavelength range by using the near field of a dipole

We analyze the far field resolution of apertures which are illuminated by a point dipole located at subwavelength distances. It is well known that radiation emitted by a localized source can be considered a combination of travelling and evanescent waves, when represented by the angular spectrum method. The evanescent wave part of the source can be converted to propagating waves by diffraction at the aperture thereby it contributes to the far field detection. Therefore one can expect an increase in the resolution of objects. We present explicit calculations showing that the resolution at the far zone is improved by decreasing the source-aperture distance. We also utilize the resolution enhancement by the near field of a dipole to resolve two closely located apertures. The results show that without the near field (evanescent field) the apertures are not resolved whereas with the near field of the dipole the far zone intensity distribution shows improved resolution. This method eliminates the requirements of near-field techniques such as controlling and scanning closely located tip detectors.Comment: 3 pages, 3 figure

Pendidikan Seks Bagi Anak Berkebutuhan Khusus

Nowadays, sex education for children with special needs becomes a necessity. In term of it, besides based on philosophical and juridical, sex education is the preventive efforts in order that every child with special needs can recognize, understand, handle his/her biological development and change. In addition sex education for children with special needs also aims at guiding them to appreciate other people\u27s sexual behavior and not to make them being stuck on deviate sex conduct as well as not getting violence and sexual abuse from others. This is because their physical and psychological condition, which has some problems, enables them to be easily manipulated and courted, so that many of them are often stuck to be the object of sexual harassment of irresponsible person. This writing specifically is going to explain the concept of sex education for children with special needs, which includes characteristic of children with special needs, theory of sex education, the anvil of sex education, as well as material, method, and teacher competencies in the implementation of sex education for them. Pendidikan seks bagi anak berkebutuhan khusus kini menjadi sebuah keniscayaan. Perihal tersebut selain didasarkan secara filosofis maupun yuridis, pendidikan seks merupakan upaya preventif agar setiap anak berkebutuhan khusus dapat mengenali, memahami dan mengelola perkembangan dan Perubahan secara biologis pada dirinya, menghargai perilaku seks orang lain, serta tidak terjebak pada perilaku seks yang menyimpang ataupun mendapatkan kekerasan dan pelecehan seks dari orang lain. Sebab seiring dengan kondisi fisik dan psikologi yang bermasalah menjadikan anak berkebutuhan khusus mudah dimanipulasi, dirayu, sehingga kerap kali terjebak untuk dijadikan objek pelampiasan syahwat oleh orang yang berkepribadian buruk. Tulisan ini secara khusus akan menguraikan tentang konsep pendidikan seks bagi anak berkebutuhan khusus mencakup karakteristik anak berkebutuhan khusus, teori pendidikan seks, landasan pendidikan seks, materi, metode serta kompetensi guru dalam pelaksanaan pendidikan seks