Designing polymers for nuclear track detection

This article describes our attempts since 1996 to systematically design andsynthesize monomers and corresponding polymers for nuclear track detection. So far more than 15 homopolymers.copolymers have been prepared and tested by us for this purpose. Some of these polymers show better track detection characteristics vis-á-vis commercially available poly allyl diglycol carbonate (PADC) track detectors.Author Affiliation: V S Nadkarni 1.Department of Chemistry, Goa University, Goa-403 206, India E-mail : [email protected] of Chemistry, Goa University, Goa-403 206, Indi

Parmod Kumar, Surender Kumar & Laxmi Joshi, Socio-economic and Environmental Indications of Agricultural Residue Burning: A Case Study of Punjab, India

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Quasi-invariance of analytic measures on compact groups

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Poor ovarian reserve and male infertility in a rural in vitro fertilization setup: a case report

Female fertility begins to decline many years prior to the onset of menopause despite continued regular ovulatory cycles. Although there is no strict definition of advanced reproductive age in women, infertility becomes more pronounced after the age of 35. In the female, the number of oocytes decreases with age until the menopause. Oocyte quality also diminishes, due in part to increased aneuploidy because of factors such as changes in spindle integrity. Although older male age affects the likelihood of conception, abnormalities in sperm chromosomes and in some components of the semen analysis are less important than the frequency of intercourse. Age is as accurate as any other predictor of conception with assisted reproductive technology

Modification of crystallinity and structure in powder processing of polytetra fluoroethylene

The modification of structure, crystallinity and orientation have been studied in powder processed polytetrafluoroethylene by various techniques. It was found that crystallinity (as determined from regression curve analysis) in unsintered samples decreased with increase of compaction pressure while in sintered specimen it increased with increase of pressure. The crystallinity was also found to vary inversely with logarithm of cooling rate. Microfocus X-ray diffraction revealed the orientation of c-axis lying preferentially in the plane perpendicular to applied pressure. There was slight variation in the lattice dimension especially the c-axis in completely sintered specimen. The infrared studies showed the presence of some of the bands depended upon the molding/sintering conditions. These various findings have been explained on the basis of compaction and recrystallization behaviour under constrained conditions

Envisioning a professional identity: charting pathways through social work education in India

This paper presents an overview of social work as a profession in India, tracing its historical beginnings, philosophical base, dominant practice perspectives, its relevance in the country’s current socioeconomic and politicocultural context and its impact on emerging trends in global practice. It also aims to stimulate discussion on the possible ways through which Social Work education can make significant contributions in the wake of the changing trends in state responsibility towards the poor and marginalised and in doing so carve its professional identity in order to gain its rightful status in Indian society

Knowing a cross-talk between embryo and endometrium can help to achieve successful pregnancy outcome in recurrent implantation failure

Recurrent implantation failure is most distressing condition to both couple as well as doctor in the field of reproductive medicine. Patients have already undergone various ART treatments with no favourable outcome and are drained emotionally as well as economically. To overcome this obstacle a comprehensive approach is needed. In this case report, we are addressing a couple who came to us with primary infertility of 15 yrs, with recurrent IVF failures (four cycles of IUI, seven cycles of ICSI both fresh and frozen and with ovum donation in last two cycle), with poor ovarian reserve and male factor infertility for surrogacy as a last option. After complete evaluation of couple, recurrent Implantation failure is thought to be due to poor endometrium and bad embryo quality, and we counselled couple to go for ovum donation and ICSI before considering surrogacy. To improve endometrial receptivity we performed local endometrial injury, oral estradiol therapy, intrauterine G-CSF instillation and IVIG etc. Simultaneously for better quality of embryo we decided to choose ovum donation due to poor ovarian reserve and advance age of the patient and ICSI was done with husband sperm after treatment of male factor infertility and ET was performed. Patient conceived in first cycle with single live intrauterine pregnancy, her antenatal course was uneventful and delivered a healthy baby at term without any complication

Effect of processing condition and composition on the microhardness of Cu-(2.5-10)vol.%Al₂O₃ nanocomposite powder particles produced by high energy mechanical milling

Nanostructured Cu-(2.5-10vol.%)Al₂O₃ nanocomposites were produced using high energy mechanical milling. For the as-milled Cu- Al₂O₃ composite powder particles having Al₂O₃ volume fractions of 2.5% and 5%, the increase in average microhardness is significant with the increase of milling time from 12 hours to 24 hours. With the increase of the content of Al₂O₃ nanoparticles the microhardness increases and in the range of 255HV-270HV. The milled nanocomposite powders were heat treated at 150, 300, 400 and 500°C for 1 hour, respectively, to determine the thermal stability of the powder particles as a function of annealing temperature. The average microhardness increased/decreased for the Cu- Al₂O₃ composites after annealing at 150°C due to the dislocation density, while increasing the annealing temperature to 300°C and 400°C the average microhardness almost remained mostly unchanged. Further increasing the annealing temperature to 500°C causes significant decrease in average microhardness due to reduction in dislocation density and coarsening of Cu grains of the Cu- Al₂O₃ composite powders produced after 24 hours of milling. This paper is to report and discuss the changes of the microhardness of the material, caused by the compositions and processing conditions, used to fabricate the Cu-(2.5-10)vol.% Al₂O₃ nanocomposite powders

A study of the solid-state polymerization of trithiane

The temperature dependence of the rate of solid-state polymerization of trithiane was investigated in conjunction with calorimetric measurements of the heat capacity of the irradiated monomer as a function of temperature. It was found that the rate of change of entropy with temperature exhibited a maximum at about 175°C. The curve of per cent polymerization versus isochronal, post-irradiation polymerization temperature also peaked at some 175°C. Finally, the existence of a crystalline phase-transition in the monomer at about 194°C was discovered by DSC and was confirmed by X-ray powder diffraction and by optical microscopy. Two models which may interrelate this set of phenomena are suggested