Ultra cold neutrons: determination of the electric dipole moment and gravitational corrections via matter wave interferometry

We propose experiments using ultra cold neutrons which can be used to determine the electric dipole moment of the neutron itself, a well as to test corrections to gravity as they are foreseen by string theories and Kaluza-Klein mechanisms.Comment: 3 pages, no figures, reference adde

The signature of the scattering between dark sectors in large scale cosmic microwave background anisotropies

We study the interaction between dark sectors by considering the momentum transfer caused by the dark matter scattering elastically within the dark energy fluid. Describing the dark scattering analogy to the Thomson scattering which couples baryons and photons, we examine the impact of the dark scattering in CMB observations. Performing global fitting with the latest observational data, we find that for a dark energy equation of state $w<-1$, the CMB gives tight constraints on dark matter-dark energy elastic scattering. Assuming a dark matter particle of proton mass, we derive an elastic scattering cross section of $\sigma_D < 3.295 \times 10^{-10} \sigma_T$ where $\sigma_T$ is the cross section of Thomson scattering. For $w>-1$, however, the constraints are poor. For $w=-1$, $\sigma_D$ can formally take any value.Comment: 9 pages, 6 figures, accepted for publication in PR

Factors influencing quality of life of patients living with mental illness: a case study of Mathari National Teaching and Referral Hospital

Objective: To determine the quality of life and associated factors of people living with mental illness attending the outpatient clinics at Mathari National Teaching and Referral Hospital.Design: A cross-sectional studySetting: The outpatient clinics at Mathari National Teaching and Referral HospitaL.Subject: 384 patients living with mental illness on follow-up were recruited into the study. Those consenting filled in the quality of life instrument (WHOQOL-BREF), as well as a socio-demographic questionnaire.Results: The study found that quality of life was lower than general statistical comparisons, and was found to be related to the marital status of the patient and their income level.Conclusion: Quality of life tends to be somewhat lower than average in people living with mental illness. It may be affected by marital status and income

Status of greenhouses in Khartoum and Gezira States, Sudan

&nbsp;&nbsp; Greenhouse technology facilitates the cultivation of most horticultural crops in any region of the world, provided that the greenhouse is properly designed and equipped to control environmental conditions. The objective of this study was to investigate the characteristics of greenhouses in Khartoum and Gezira States, Sudan, and show their drawbacks and disadvantages.&nbsp; A survey was carried out using a questionnaire and interviews with greenhouse owners in Khartoum and Gezira States. Khartoum and Gezira States have about 68 greenhouse projects, 33 of them were selected for the study. The data were collected during 2013 and were analyzed using statistical package for social sciences (SPSS) computer program. Results showed that 69.7% of greenhouses were privately owned and the vast majority of greenhouses were used to produce vegetable crops or seedlings. Results indicated that most of the greenhouses designs are not suited to the hot arid tropics of the Sudan. More than half of greenhouses had the arched system, most of them were covered by polyethylene, 69.7% of greenhouses were constructed in a single span, 72.7% had a single door, 76.3% of greenhouses had a height between 2.5 m to 3 m and 42.6% of them were 40 m long. Accordingly, an ideal greenhouse design is needed in which all the drawbacks and shortcomings are corrected to suit the arid conditions of central Sudan

Current status of tomato greenhouse production in Khartoum and Gezira States, Sudan.

Tomato production under protected cultivation has increased consistently in recent decades in the Sudan. The objective of this study was to investigate the current situation of tomato cultural practices in existing greenhouses in Khartoum and Gezira States. A survey was carried out using a questionnaire and interviews with greenhouse owners in Khartoum and Gezira States. Khartoum and Gezira States have about 68 greenhouse projects, 33 of them were selected for the study. Data were collected during 2013 and analyzed using statistical package for social sciences (SPSS). Results indicated that a large number of introduced tomato cultivars were used for production and most of greenhouse farmers (48.5%) sow tomato seeds in mid-February. The majority of farmers (63.6%) grow tomato in high plant density (30cm). More than half of greenhouses (75.8 %) had no specific fertilizer programs. Most of the greenhouse farmers (90.9 %) prune weekly. All greenhouse farmers used pesticides for pest control. Our observations indicated that most of the growers failed to produce summer tomato. Accordingly, further research in tomato greenhouse production is needed

Static potential in scalar QED3_3 with non-minimal coupling

Here we compute the static potential in scalar $QED_3$ at leading order in $1/N_f$. We show that the addition of a non-minimal coupling of Pauli-type (\eps j^{\mu}\partial^{\nu}A^{\alpha}), although it breaks parity, it does not change the analytic structure of the photon propagator and consequently the static potential remains logarithmic (confining) at large distances. The non-minimal coupling modifies the potential, however, at small charge separations giving rise to a repulsive force of short range between opposite sign charges, which is relevant for the existence of bound states. This effect is in agreement with a previous calculation based on M$\ddot{o}$ller scattering, but differently from such calculation we show here that the repulsion appears independently of the presence of a tree level Chern-Simons term which rather affects the large distance behavior of the potential turning it into constant.Comment: 13 pages, 3 figure

Controlling the quantum computational speed

The speed of quantum computation is investigated through the time evolution of the speed of the orthogonality. The external field components for classical treatment beside the detuning and the coupling parameters for quantum treatment play important roles on the computational speed. It has been shown that the number of photons has no significant effect on the speed of computation. However, it is very sensitive to the variation in both detuning and the interaction coupling parameters.Comment: 9 pages, 10 figure

Integrable models: from dynamical solutions to string theory

We review the status of integrable models from the point of view of their dynamics and integrability conditions. Some integrable models are discussed in detail. We comment on the use it is made of them in string theory. We also discuss the Bethe Ansatz solution of the SO(6) symmetric Hamiltonian with SO(6) boundary. This work is especially prepared for the seventieth anniversaries of Andr\'{e} Swieca (in memoriam) and Roland K\"{o}berle.Comment: 24 pages, to appear in Brazilian Journal of Physic

Impulse Response with Correlation Study of a Broadband Bended Wearable Monopole Antenna

In this paper, the impulse response of a wide band flexible circular monopole antenna is presented. The antenna is fabricated on liquid crystalline polymer flexible substrate with a compact geometry that makes it suitable for wearable applications under different bending conditions. The antenna is fed by coplanar waveguide transmission line and has a compact total size of 40 × 22 mm2. The presented antenna has a good performance over the operating frequency range for straight and bent configurations. The design principals, simulation and experimental results are presented in this work