An electroviscous damper

A new type of vibration damper for rotor systems was developed and tested. The damper contains electroviscous fluid which solidifies and provides Coulomb damping when an electric voltage is imposed across the fluid. The damping capacity is controlled by the voltage. The damper was incorporated in a flexible rotor system and found to be able to damp out high levels of unbalanced excitation. Other proven advantages include controllability, simplicity, and no requirement for oil supply. Still unconfirmed are the capabilities to eliminate critical speeds and to suppress rotor instabilities

Audit of Antenatal Care at a Rural District of KZN, South Africa

Background: Maternal and perinatal mortality remain a big challenge in developing countries, including South Africa, where the figures are amongst the highest in the world. Provision of adequate antenatal care is regarded as a cornerstone of maternal and perinatal health care and is expected to have a considerable impact on achieving the Millennium Development Goals. The detection of high-risk pregnancies through antenatal care has been advocated as a good tool to reduce maternal mortality in developing coun- tries. The South African Government\'s response in terms of providing free maternal care in public health facilities is commendable but access to quality antenatal care is still questionable. We conducted this audit to evaluate the quality of antenatal care/services provided against the set national standards at the first (booking) visit, and visits at 28 and 36 weeks of gestation, as part of a quality improvement initiative.Methods: A retrospective cross-sectional descriptive study was undertaken, targeting women who attended public health institutions for antenatal care in the Empangeni sub-district of Uthungulu, which is a health district in KwaZulu-Natal province. Data were collected from 244 pregnant mothers\' antenatal care records after delivery, and a random selection from a total of 5 109 women who delivered in Empangeni hospital during July to December 2004. Frequency tables were produced on the predetermined selective antenatal care indicators. A Pearson correlation test was conducted to determine the significant relations, if any, among variables. Results: The majority of the pregnant mothers were unemployed and poor. Virtually all of them (99.6%) had attended public healthcare (PHC) facilities for antenatal care (88% attended PHC clinics and the rest attended hospitals) and each woman had, on average, six antenatal visits. One quarter did not enrol for a prevention of mother-to-child transmission (PMTCT) programme. Only 9% of pregnant women booked a visit during their first trimester period but most of them (two-thirds) booked a visit during the second trimester of pregnancy. History-taking was done for every woman. Recording of haemoglobin (Hb) estimation was high at the first visit (95%) but low at 28 and 36 weeks (46% and 30% respectively). Recording of syphilis screening was very low (18%) at the first visit and only 2% was screened at 36 weeks. Only 16% received adequate treatment in cases where the results were positive. At 36 weeks, only 2% had a Wasserman reaction (WR) test done to screen syphilis at term. Over half (55%) of the pregnant women received three doses of tetanus toxoid vaccination before delivery. Conclusion: The study showed that the standard of antenatal care offered in the Empangeni sub-district fell short of the required level. This lack of proper care represents missed opportunities to impact optimally on maternal and perinatal health outcomes. Thus strategies are urgently needed to improve antenatal care through a quality improving initiative. South African Family Practice Vol. 50 (3) 2008: pp. 66-66

Risk Factors for Anaemia in Pregnancy in Rural KwaZulu-Natal – South Africa: Implication for Health Education and Health Promotion

Background: Anaemia in pregnancy is a major public health problem in developing countries. It is associated with an increased risk of maternal and perinatal morbidity and mortality. A high rate of anaemia in pregnancy in the rural population of KwaZulu-Natal (30% according to national and 57% according to the World Health Organization [WHO] definition of anaemia in pregnancy) is observed. The risk factors for anaemia, particularly during pregnancy, are multiple and complex and their relative contributions are known to vary by geographic areas and by seasons. In order to design an intervention for treatment and prevention of anaemia in pregnancy, studies to assess the aetiological factors are necessary. The aim of this study was to evaluate the strength of association between intestinal helminthiasis, urinary schistosomiasis and HIV infection on anaemia in pregnancy.Methods: A retrospective case-control study design was used in a rural district hospital of South Africa. A total of 300 pregnant women, 100 of them with anaemia (haemoglobin less than 10 gm/dL according to the national definition of anaemia in pregnancy) referred as cases and 200 controls were studied from Empangeni Hospital. Both cases and controls were matched for age, parity and gestational age. Data were collected from the antenatal clinic and prevention of mother-to-child transmission of HIV (PMTCT) programme registers for cases and controls at their booking visit during the months of May, June and July of 2004. Univariate and multiple logistic regression were performed to analyse the data.Results: Of the cases, 48% and 1% among the controls had intestinal helminthiasis, resulting in the odds ratio of 42 (p = 0,000 and 95% CI 9,96 – 176.59). The risk of anaemia was related to urinary schistosomiasis, as 27% of the cases compared to 1% of controls was found with anaemia. The odds ratio was 12 (p = 0,000 and 95% CI 3.58 – 41.02). These parasitic infestations are known to cause chronic haemorrhage and iron deficiency resulting in the development of anaemia in pregnancy. Transmissions of intestinal parasitic infestation occur through the faecal-oral route. Personal hygiene and other environmental factors are therefore an important factor for the transmission of the disease. To reduce the transmission of faecaloral diseases (e.g. intestinal helminthiasis and urinary schistosomiasis) key interventions recommended are: 1) safe disposal of human excreta, 2) hand-washing practices with soap after defecation, and 3) maintenance of drinking water free from faecal contamination. Similarly, HIV infection increased the chance of developing anaemia in pregnancy twofold as HIV infection was more common among cases (56%) than among controls (37%), resulting in an odds ratio of 2.11 (p = 0,003 and 95% CI 1.123 – 3.21). The prevention of HIV infection and transmission can be achieved through the improvement of knowledge of these conditions. These can be achieved through health education and health promotion.Conclusion: These findings confirm and conform to other studies on the association between anaemia in pregnancy and parasitic and HIV  infections. Antenatal care should promote de-worming and education on personal hygiene and HIV (risk factors, mode of transmission, etc.). The provision of safe water supply and toilet facilities for the rural communities should be considered urgently to prevent and promote better health for all, including pregnant women

Contraceptive practices in the era of HIV/AIDS among university students in KwaZulu-Natal, South Africa

University students as a population of young adults are reportedly at a higher risk of acquiring sexually transmitted infections and HIV infection than the general public due to their higher levels of sexual  experimentation and unsafe sexual practices. The objective of thiscross-sectional study was to find the patterns of contraceptive use among university students at Mangosuthu University of Technology (MUT), KwaZulu-Natal, South Africa. A total of 752 students were selected by stratified random sampling techniques. A self-administered questionnaire probing contraceptive usage and reasons for non-usage was used to collect data. The results were summarized using means (SD) for continuous variables and percentages for categorical variables. Chi-square test was used to find the association between gender and contraceptive use. The mean age of the participants was 21.25 years (SD ¼ 2.99). Fifty-ninepercent (n ¼ 442) were sexually active. Of the sexually active students, 90.7% (n ¼ 401) used contraceptives. Among contraceptive users, 90.5% (n ¼ 363) used condoms. Gender was not significantly associated (p ¼ 0.327) with contraceptive use, but there was a significant association between gender and condom use as males used condom more than females (p , 0.001). Eighty-one percent (n ¼ 323) of the sexually active students reported that they had used a contraceptive the last time they had sex. Regarding frequency of contraceptive use, 38.7% (n ¼ 155) reported that they use contraceptives sometimes or rarely. The frequency of contraceptive use was not significantly related to gender (p ¼ 0.305). Among 60 participants those who disapproved of using contraception, 68.3% (n ¼ 41) were afraid that contraception would cause sterility and 6 students reported that contraception would make their partner promiscuous. In conclusion, a large proportion of university students at MUT in South Africa are sexually active and use contraception, but the use may be inconsistent. Thus, more research is needed to create  interventions on contraception uptake

A more precise mapping of trp-5 in Neurospora crassa

A more precise mapping of trp-5 in Neurospora crass

Simulated rotor test apparatus dynamic characteristics in the 80- by 120-foot wind tunnel

A shake test was conducted in the 80 by 120 foot Wind Tunnel at NASA Ames Research Center, using a load frame and dummy weights to simulate the weight of the NASA Rotor Test Apparatus. The simulated hub was excited with broadband random excitation, and accelerometer responses were measured at various locations. The transfer functions (acceleration per unit excitation force as a function of frequency) for each of the accelerometer responses were computed, and the data were analyzed using modal analysis to estimate the model parameters

EFFECTS OF LAND-USE CHANGE ON THE PROPERTIES OF TOP SOIL OF DECIDUOUS SAL FOREST IN BANGLADESH

This study examined the effects of land use change on the physico-chemical properties of top soil in the deciduous Sal forest of Bangladesh. Relatively less disturbed Sal (Shorea robusta Roxb. Ex Gaertn.) forest stands and the nearby stands those were converted into Acacia (Acacia auriculiformis Benth.) plantation and pineapple (Ananus comosus (L.) Merr.) cultivation were selected to examine the effects of land use change on soil properties. For each land use type, soil samples were collected from 4 locations, 50m distant from each other, as replicates. Soil samples were collected at 0-5, 5-10, and 10-15 cm depths. Soil moisture content, conductivity, pH organic C, total N and total P were determined as soil properties. Leaf litter of Sal, Acacia and pineapple was incubation for 90 and 180 days in independent identical soil in order to examine the effects of plant species through leaf litter on the soil chemical nutrient (N and P) status. Data showed that soil moisture content, conductivity and pH were significantly affected by land use but not by depth. However, soil organic C was affected by both land-use type (P< 0.02) and soil depth (P< 0.003), although no significant interactions appeared between these two factors. Soil total N and P did not differ between land use types but by depth and, N and P contents decreased with the increase of depth. Rates of nutrients (N and P) released from Sal, Acacia and pineapple did not differ significantly among them during incubation. Results of the present study reveal that properties of the top soil of the Madhupur Sal forest are different in their responses to the varying land uses. The findings of this study are thus relevant for the sustainable management of the deciduous Sal forest ecosystems

Temporal variation in seed quality of Indian spinach preserved in different containers

The experiment was conducted to investigate the seed quality of Indian spinach for three months stored at different containers (Plastic pot, polythene bag and cloth bag) during 2013-2014 at Seed Technology Laboratory of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur. The initial moisture content of the seed was 9.89% with 75.00% germination. However, after two months, the seed had a different range of increased moisture content with reduced germination percentage depending upon the packing materials. Among the three containers, seeds stored at cloth bag absorbed more moisture (14.36%) from surrounding atmosphere followed by the moisture content, 12.67% and 11.50% of polythene bag and airtight plastic pot, respectively. Seeds stored at plastic pot, polythene bag and cloth bag exhibited 65.00, 64.00 and 50.00 per cent germination, respectively. Similarly, the fresh weight and dry weight of seedling and seedling vigor were also decreased. The seeds of plastic pot were good in term of germination capacity, fresh and dry weight and vigor index in comparison to those stored at cloth bag and polythene bag.Int. J. Agril. Res. Innov. & Tech. 5 (2): 51-57, December, 201