Displaced dynamics of binary mixtures in linear and nonlinear optical lattices

The dynamical behavior of matter wave solitons of two-component Bose-Einstein condensates (BEC) in combined linear and nonlinear optical lattices (OLs) is investigated. In particular, the dependence of the frequency of the oscillating dynamics resulting from initially slightly displaced components is investigated both analytically, by means of a variational effective potential approach for the reduced collective coordinate dynamics of the soliton, and numerically, by direct integrations of the mean field equations of the BEC mixture. We show that for small initial displacements binary solitons can be viewed as point masses connected by elastic springs of strengths related to the amplitude of the OL and to the intra and inter-species interactions. Analytical expressions of symmetric and anti-symmetric mode frequencies, are derived and occurrence of beatings phenomena in the displaced dynamics is predicted. These expressions are shown to give a very good estimation of the oscillation frequencies for different values of the intra-species interatomic scattering length, as confirmed by direct numerical integrations of the mean field Gross-Pitaevskii equations (GPE) of the mixture. The possibility to use displaced dynamics for indirect measurements of BEC mixture characteristics such as number of atoms and interatomic interactions is also suggested.Comment: 8 pages, 21 figure

Estimation of pKBH+ of Some Mesoionic Thiones

533-53

A clinical study on ultrasonographic measurement of cervical length at 18-24 weeks of gestation and pregnancy outcome

Background: Preterm labour and preterm birth is the leading cause of perinatal mortality, whose incidence is approximately 10% of all live births worldwide. This study was undertaken to evaluate the cervical length ultra-sonographically at 18 to 24 weeks of gestation in asymptomatic women and study the pregnancy outcomes and predicting risk of preterm labour and delivery.           Methods: This hospital based prospective study was conducted by enrolling 1500 antenatal patients with gestations between 18 and 24 weeks, after fulfilling the inclusion and exclusion criteria. Their cervical lengths were measured by USG and they followed through their pregnancy, labour and delivery & all the relevant data were recorded, studied & statistically analysed.         Results: Out of 1500 patients enrolled, 90 were lost to follow up. Therefore, all the result analyses were done for 1410 patients. Majority of the patients belonged to age group 21- 30 years (830= 58.86%), primigravida ( 47.87%), from urban background (67.17%), belonged to lower socio-economic status (61.70%), at 21 weeks of gestation (28.15%). 960 patients had labour at term (68.08%), 360 (25.54%) had preterm  and 90 (6.38%) had postterm labour. With cervical length 3.0 cm, 71 (9.59%) landed up in preterm labour. When statistically analysed, the association between cervical length and gestational age at which labour started were very significant and results showed ᵡ2=190.01 , df= 1,  P< 0.0001 (very significant ). As the cervical length increases, the median gestational age at which labour started also increases which was found to be significant (r = 0.98, P<0.01).Conclusions: Shorter cervices lead to shorter gestations and early labour. Thus ultrasonographic measurement of cervical length at 18-24 weeks of gestation is very important, more so in asymptomatic women and can be utilized as a tool for predicting adverse pregnancy outcome especially preterm labour and delivery

Environmental Impacts of Ship Breaking and Recycling Industry of Sitakunda, Chittagong, Bangladesh

Ship dismantling of Bangladesh is a reason of concern due to its economic values and environmental hazards. This study focuses on the Ship Breaking and Recycling Industry (SBRI) of Bangladesh to assess the environmental impacts. It was done by analyzing the water quality parameters like, Turbidity, Salinity, Electric conductivity (EC), Dissolved Oxygen (DO), pH, Total Dissolved Solids (TDS), Temperature, Ammonia-Nitrogen, Nitrate–Nitrogen, Phosphate concentrations of inside and surroundings of Ship Breaking Yard. Turbidity ranged from 7.71 to 119 FTU in and 4.07 to 41.74 FTU in inside and outside the ship breaking yard, respectively. Salinity ranged from 0.95 to 14.28 ppt and 0.06 to 0.79 ppt in insde and outside, respectively. Value of EC varied from1.75 to 1280 µs/cm in inside and 0.21 to 15.7 µs/cm in outside, DO ranged from 3.77 to 7.94 mg/l in inside and 1.95 to 5.34 mg/l in outside. TDS value ranged from1280 to 15340 mg/l in inside and 74 to 825 mg/l in outside of ship breaking yard. Ammonia-N value ranged from 0.46 to 7.046 mg/l, Nitrate-N value ranged from 0.10 to 6.9 mg/l and Phosphate value ranged from 0.175 to 4.75 mg/l in the analyzed water sample. Magnitude of environmental alteration by establishment of ship breaking industry was assessed by quantifying Environmental impact value of Study area and the value was found as -93, where ecological parameters value was found -72, Physico-chemical parameters value was -70 and human interest value was found +49 which indicate negative alteration on environment

Larvicidal efficacy of Toddalia asiatica (Linn.) Lam against two mosquito vectors Aedes aegypti and Culex quinquefasciatus

The hexane, acetone and methanol extracts of mature fruits and leaves from Toddalia asiatica was investigated to establish its bio-control potentiality under laboratory condition against fourth instars larvae of Dengue vector, Aedes aegypti and Filarial vector, Culex quinquefasciatus. Hexane extract of fruits of T. asiatica showed highest larvicidal activity against both mosquito vector. LC50 value of hexane, acetone and methanol extracts of fruits against A. aegypti were 37.23, 50.69 and 125.55 ppm and against C. quinquefasciatus were 33.23, 82.20 and 215.19 ppm, respectively. Hexane, acetone and methanol extracts of leaves also showed potency against A. aegypti with LC50 values of 133.80, 177.20 and 79.48 and against C. quinquefasciatus with LC50 values of 164.53, 175.28 and 87.87 ppm, respectively .These results suggested that T. asiatica is promising as larvicide against both targeted mosquitoes