Hysterosalpingographic findings in infertile women: A seven year review

Objectives: To review the hysterosalpingographic (HSG) findings in women investigated for infertility in a tertiary center in north eastern Nigeria.Materials and Methods: A retrospective review of HSG films of 272 women investigated for infertility between January 2000 and December 2006 were reviewed.Results: One hundred and thirty (47.8%) were investigated for primary infertility, while 142 (52.2%) were investigated for secondary infertility. Most of the women investigated for infertility by HSG had abnormal findings 192(70.6%). The most common pathology revealed among the infertile women was tuboperitoneal factor in 196 (72.1%) followed by uterine synechia in 35(12.9%). Seventeen (6.3%) had bilateral tubal block and 5 (1.8%) had bicornuate uterus.Conclusion: HSG is helpful in the investigation of infertile women

Outdoor node localization using random neural networks for large-scale urban IoT LoRa networks

Accurate localization for wireless sensor end devices is critical, particularly for Internet of Things (IoT) location-based applications such as remote healthcare, where there is a need for quick response to emergency or maintenance services. Global Positioning Systems (GPS) are widely known for outdoor localization services; however, high-power consumption and hardware cost become a significant hindrance to dense wireless sensor networks in large-scale urban areas. Therefore, wireless technologies such as Long-Range Wide-Area Networks (LoRaWAN) are being investigated in different location-aware IoT applications due to having more advantages with low-cost, long-range, and low-power characteristics. Furthermore, various localization methods, including fingerprint localization techniques, are present in the literature but with different limitations. This study uses LoRaWAN Received Signal Strength Indicator (RSSI) values to predict the unknown X and Y position coordinates on a publicly available LoRaWAN dataset for Antwerp in Belgium using Random Neural Networks (RNN). The proposed localization system achieves an improved high-level accuracy for outdoor dense urban areas and outperforms the present conventional LoRa-based localization systems in other work, with a minimum mean localization error of 0.29 m

The Dirac Oscillator. A relativistic version of the Jaynes--Cummings model

The dynamics of wave packets in a relativistic Dirac oscillator is compared to that of the Jaynes-Cummings model. The strong spin-orbit coupling of the Dirac oscillator produces the entanglement of the spin with the orbital motion similar to what is observed in the model of quantum optics. The collapses and revivals of the spin which result extend to a relativistic theory our previous findings on nonrelativistic oscillator where they were known under the name of `spin-orbit pendulum'. There are important relativistic effects (lack of periodicity, zitterbewegung, negative energy states). Many of them disappear after a Foldy-Wouthuysen transformation.Comment: LaTeX2e, uses IOP style files (included), 14 pages, 9 separate postscript figure

Benefit incidence analysis of free insecticide treated nets distribution in urban and rural communities of Enugu state, South East Nigeria

Background: Malaria is a leading cause of mortality as well as a barrier to economic and social development in developing countries. The use of insecticide‑treated nets (ITNs) for malaria vector control is effective in controlling malaria attacks in pregnant women and under‑5 children. The Nigerian government, in its bid to achieve the Millennium Development Goal (MDG) 4 and 5 distributes free ITNs to pregnant mothers and under‑five children in the Roll Back Malaria programme (RBM).Aim: This study compared the benefit incidence analysis of this government program between urban and rural areas.Materials and Methods: Pretested, semi‑structured questionnaires were administered to 150 pregnant women and also 150 mothers of under‑5 children, who were randomly selected from each of the two communities (rural and urban) from a local government area (LGA) in Enugu state, Nigeria. The study was conducted within the rainy season periods (March–August) of 2008. The information obtained included some socio‑economic variables, accessibility, usage and benefits of usage of ITNs. Data entry and analyses were done using the Statistical Package for Social Sciences (SPSS) version 15.0(Chicago IL, USA). Student’s t‑test and Chi‑square were used for comparison where appropriate. Significant values were taken as P value. Value of less than 0.05 was considered significant.Results: The respondents’ mean monthly expenditures on food utilities and anti‑malarials in the rural area and urban areas were N266.1 (74.02), range (143.3-395) and N473 (90) range (380-495.7) respectively (P < 0.001). Within each socio‑economic stratum (SES), the average monthly expenditure in the urban community was higher than that of the rural community except for least poor SES (P < 0.05). For the urban community, 106 (71.6%) respondents used ITNs as against 99 (66.9%) in the rural community [P = 0.778, OR = 1.3 (95% CI: 0.76, 2.05)]. Also, ITNs were always accessible to 112 (75.7%) and 54 (36.5%) respondents in the urban and rural communities respectively [P < 0.001, OR = 5.4 (95% CI: 3.28, 8.96)]. In the urban community, 130 (87.7%) respondents expressed some benefit from ITNs as against 123 (83.1%) respondents from the rural community [P = 0.258, OR = 1.5 (95% CI: 0.76, 2.28)].Conclusion: Most pregnant women and mothers of under‑five children in the rural study area belong to the poorest socio‑economic classes and they spend less on anti‑malarial treatment. Majority of the free ITN’s beneficiaries in both urban and rural study areas have used and benefitted from themKey words: BIA, ITNs, nigeria, pregnanc

Performance of a live multi-gateway LoRaWAN and interference measurement across indoor and outdoor localities

Little work has been reported on the magnitude and impact of interference with the performance of Internet of Things (IoT) applications operated by Long-Range Wide-Area Network (LoRaWAN) in the unlicensed 868 MHz Industrial, Scientific, and Medical (ISM) band. The propagation performance and signal activity measurement of such technologies can give many insights to effectively build long-range wireless communications in a Non-Line of Sight (NLOS) environment. In this paper, the performance of a live multi-gateway in indoor office site in Glasgow city was analysed in 26 days of traffic measurement. The indoor network performances were compared to similar performance measurements from outdoor LoRaWAN test traffic generated across Glasgow Central Business District (CBD) and elsewhere on the same LoRaWAN. The results revealed 99.95% packet transfer success on the first attempt in the indoor site compared to 95.7% at the external site. The analysis shows that interference is attributed to nearly 50 X greater LoRaWAN outdoor packet loss than indoor. The interference measurement results showed a 13.2–97.3% and 4.8–54% probability of interfering signals, respectively, in the mandatory Long-Range (LoRa) uplink and downlink channels, capable of limiting LoRa coverage in some areas

Nonlinear collective nuclear motion

For each real number $\Lambda$ a Lie algebra of nonlinear vector fields on three dimensional Euclidean space is reported. Although each algebra is mathematically isomorphic to $gl(3,{\bf R})$, only the $\Lambda=0$ vector fields correspond to the usual generators of the general linear group. The $\Lambda < 0$ vector fields integrate to a nonstandard action of the general linear group; the $\Lambda >0$ case integrates to a local Lie semigroup. For each $\Lambda$, a family of surfaces is identified that is invariant with respect to the group or semigroup action. For positive $\Lambda$ the surfaces describe fissioning nuclei with a neck, while negative $\Lambda$ surfaces correspond to exotic bubble nuclei. Collective models for neck and bubble nuclei are given by irreducible unitary representations of a fifteen dimensional semidirect sum spectrum generating algebra $gcm(3)$ spanned by its nonlinear $gl(3,{\bf R})$ subalgebra plus an abelian nonlinear inertia tensor subalgebra.Comment: 13 pages plus two figures(available by fax from authors by request

Beyond Prejudice as Simple Antipathy: Hostile and Benevolent Sexism Across Cultures

The authors argue that complementary hostile and benevolent componen:s of sexism exist ac ro.ss cultures. Male dominance creates hostile sexism (HS). but men's dependence on women fosters benevolent sexism (BS)-subjectively positive attitudes that put women on a pedestal but reinforce their subordination. Research with 15,000 men and women in 19 nations showed that (a) HS and BS are coherenl constructs th at correlate positively across nations, but (b) HS predicts the ascription of negative and BS the ascription of positive traits to women, (c) relative to men, women are more likely to reject HS than BS. especially when overall levels of sexism in a culture are high, and (d) national averages on BS and HS predict gender inequal ity across nations. These results challenge prevailing notions of prejudice as an antipathy in that BS (an affectionate, patronizing ideology) reflects inequality and is a cross-culturally pervasive complement to HS

Kink propagation in a two-dimensional curved Josephson junction

We consider the propagation of sine-Gordon kinks in a planar curved strip as a model of nonlinear wave propagation in curved wave guides. The homogeneous Neumann transverse boundary conditions, in the curvilinear coordinates, allow to assume a homogeneous kink solution. Using a simple collective variable approach based on the kink coordinate, we show that curved regions act as potential barriers for the wave and determine the threshold velocity for the kink to cross. The analysis is confirmed by numerical solution of the 2D sine-Gordon equation.Comment: 8 pages, 4 figures (2 in color