Startup process, safety and risk assessment of biomass gasification for off-grid rural electrification.

Biomass gasification has significantly advanced in terms of performance and is increasingly used in rural off-grid electricity applications. The downdraft gasifier is primarily used in biomass gasification applications, in which it functions as a reactor into which biomass and gasifying air are introduced to generate producer gas that is then used in an engine generator to produce electricity. However, the safety and stability of biomass gasification remain challenging and depend on several factors, such as the startup heating process, which can affect risks of fire, explosion, and toxic gas emissions. As the biomass gasification is associated with high temperatures and demands safety measures, its startup process should follow a rigorous procedure that ensures reliable operation and minimizes the risk of hazard issues. This study presents a gasifier startup heating process based on a proposed safety protocols hazard analysis. The study indicates that the heating temperature in startup processes has been identified as a critical factor due to its role in impacting safety. The findings indicate that the biomass gasification process has significant risks, including the potential for fire, explosion, and release of environmental emissions via multiple pathways. The methods proposed here could lead to reduced risk from the abovementioned issues.

Design and evaluation of a power tiller vegetable seedling transplanter with dibbler and furrow type.

Vegetable production plays a vital role in ensuring food security in Bangladesh. However, the majority of vegetable seedlings are currently transplanted manually, which is not only time-consuming but also labor-intensive and costly. In this context, a semi-automated transplanter can be considered as an alternative solution for mechanized seedling transplanting. To mechanize seedling operations, two types of transplanters were designed, fabricated and tested: the power tiller-operated semi-automatic dibbler vegetable seedling (DVS) transplanter and the furrow opener vegetable seedling (FVS) transplanter. The goal was to evaluate their performance and impact on field crop productivity. In the DVS transplanter design, the larger sprocket was adjusted to enhance the precision of hole-making by pressing the dibbler into the soil, creating holes where seedlings would be transplanted. On the other hand, the FVS transplanter utilized a furrow opener to create furrows, and the seedling is placed in these furrow at a specific distance from the furrow opener wall, where the distance between seedlings within the furrow could be adjusted based on the specific requirements of the seedling crop. The results of the evaluation indicated that both transplanters successfully planted seedlings without any missing placements, while hole covering was achieved at 115 and 118.2% for the DVS and FVS transplanters, respectively. The field capacity and field efficiency for both transplanters were determined to be 0.05 ha h-1 and 61.18%, respectively, with a coefficient of variation of 5% or less. Field tests conducted with brinjal crops at a forward speed of 1.2 km h-1 and a spacing of 0.7 × 0.6 m demonstrated that both designs yielded higher yield productivity compared to manual transplantation. Additionally, no issues related to vegetative development were observed. Both transplanters exhibited promising performance and significant potential in terms of accurately transplanting seedlings, and ensuring satisfactory transplantation quality. Furthermore, these transplanters offer several advantages, including less time-consuming, lower labor demands and even distribution of seedlings. This design encourages small to medium-level farmers seeking to engage in mechanized vegetable farming practices.

Barriers to male condom use in Rohingya refugee camps in Bangladesh: A qualitative study.

Background: Rohingya people are often called the most persecuted minority in the world. Currently, almost 800,000 Rohingya refugees live in temporary shelters in Cox's Bazar, Bangladesh. More than one-quarter of them are women and girls of reproductive age who are at increased risk of unplanned pregnancies, unsafe abortions and related complications. However, the use of contraception remains inadequate, and particularly use of condoms and male participation is scarce. This study examines the barriers to condom use as a contraceptive method among married Rohingya couples. Methods: We conducted in-depth qualitative interviews of married Rohingya men and women and thematically analysed the data. Findings: Depo Provera injections and pills are the dominant forms of contraception. Men's participation in family planning and contraceptive use is rare, and so is the use of condoms. Participants identified several barriers to condom use, including contraception being the responsibility of the women, socio-cultural issues, the stigma attached to condoms, unfamiliarity with condoms, the limitations of condoms, and issues of security in conjugal life. Health workers do not promote condoms in the same way as other contraceptive methods. Interpretation: Condom use and men's participation in contraception use are rare in Rohingya camps. The involvement of family planning workers who are males may help to promote the use of condoms and increase the method-mix options of contraceptives. Funding: La Trobe University, Melbourne, Australia.

Intimate Partner Abuse Among Rohingya Women and Its Relationship With Their Abilities to Reject Husbands' Advances to Unwanted Sex.

Currently, around a million Rohingya refugees live in Cox's Bazar, Bangladesh. Displacement from homelands and restrictions on movement in the refugee camps may exacerbate intimate partner abuse (IPA) against refugee women and their abilities to reject husbands' advances to unwanted sex. This study examines Rohingya refugee women's attitudes toward and experience of intimate partner abuse (IPA) and their impact on the abilities to reject husbands' advances to unwanted sex. A survey was conducted among Rohingya refugee women in Cox's Bazar, Bangladesh. Women's attitudes toward IPA, and experience of IPA were the exposure variables. Women's abilities to say "no" to husbands' advances to unwanted sexual intercourse was the outcome variable. Multivariable logistic regression models were used to examine the relationships. Participants' median age was 22 years (range: 13-41). Most women perceived hitting/beatings by their husbands in certain situations as justifiable, 72% had experienced such abuse and 56.5% had to engage in unwanted sexual intercourse with their husbands. Women with increasing leniency towards hitting/beatings and those who had experienced such abuse were less likely to be able to say "no" to husbands' advances to unwanted sexual intercourse. Rohingya women's attitudes toward and experience of IPA are associated with their abilities to say "no" to husbands' advances to unwanted sex. Intervention is needed to denormalize the current practice of IPA, create awareness against IPA, and ensure formal education for girls.

HIV transmission knowledge among Rohingya refugee women in Bangladesh: a cross-sectional survey.

BACKGROUND AND OBJECTIVE: Increasing numbers of Rohingya refugees have been found to be infected with HIV since they arrived in Bangladesh after being ousted from Myanmar in 2017. This study aimed to examine the knowledge about HIV transmission among Rohingya refugee women and to identify factors that are associated with that knowledge. DESIGN: A cross-sectional survey was conducted using a structured questionnaire that was based on the standard questionnaire of the Demographic and Health Survey programme. SETTING: Rohingya settlements in the Kutupalong refugee camp at Ukhiya, Cox's Bazar, Bangladesh. PARTICIPANTS: Interviews were conducted with 508 women who had married or given birth in the 2 years before the survey was done. OUTCOME MEASURE: The participants were asked to answer a set of questions to assess their knowledge about HIV transmission. RESULTS: Around 70% of the women could not accurately answer four of the eight questions, and there were substantial misconceptions about the modes of HIV transmission. Knowledge regarding HIV transmission among participants increases in conjunction with the age at which they were first married. Women who were involved in work outside their households or those whose husbands were employed were more likely than others to demonstrate relatively good knowledge of transmission. Women who had received some formal education were 2.37 times likely to show relatively good knowledge of HIV transmission than those who had not received any education. Availability of healthcare facilities in the blocks where women resided is also associated with better knowledge. However, knowledge of HIV transmission among Rohingya women was significantly lower than among women in Bangladesh and Myanmar. CONCLUSION: Most Rohingya women have inadequate knowledge of HIV transmission. Targeted interventions are needed to provide HIV education and to assist with prevention and behavioural changes.

Factors affecting child marriage and contraceptive use among Rohingya girls in refugee camps.

Background: Rohingya girls living in the refugee camps in Bangladesh are disproportionately vulnerable to child marriages and teenage pregnancies. This study examines the factors affecting child marriage and contraceptive use among Rohingya girls who have experienced child marriages. Methods: We collected and analysed quantitative and qualitative data from adolescent Rohingya girls (age 10-19 years) who experienced child marriages. The quantitative data (n=96) came from a cross-sectional survey, and the qualitative data (n=18) from in-depth interviews conducted in the world's largest refugee camp located in Cox's Bazar, Bangladesh. We also interviewed service providers (n=9) of reproductive healthcare services to gain their perspectives regarding contraceptive use among these young girls. We used descriptive statistics to characterise the girls' demographic profiles, ages at their first marriages, and contraceptive use. Thematic analysis was used for the qualitative data to identify key factors influencing child marriage and contraceptive use among these girls. Findings: On average, the adolescent female participants had been 15.7 years old when they were first married. Over 80% had given birth during the two years before the survey or were pregnant during time of the data collection. The main factors that influenced child marriage were found to be perceptions regarding the physical and mental maturity for marriage, social norms, insecurity, family honour, preferences for younger brides and the relaxed enforcement of the minimum legal age for marriage. A third (34%) of the girls said they were using contraceptives on the week when the study was conducted. The desire for children, religious beliefs, misapprehension about contraception and long waiting periods in facility-based health services and current service provision were the main factors influencing contraceptive use. Depo Provera injections and pills were the dominant methods of contraception. Contraceptive use during the period between marriage and the first childbirth is rare. Interpretation: Girl child marriage is common in Rohingya camps. Contraceptive use is rare among newly married girls before they give birth for the first time. The involvement of female and male Rohingya volunteers for outreach services can be catalytic in promoting contraceptive use. Funding: La Trobe Asia, La Trobe University, Melbourne, Australia. Bengali translation of the abstract in Appendix 1.

Attitudes to and experiences of intimate partner violence among Rohingya women who married before eighteen years of age.

Currently, around a million Rohingya refugees live in Cox's Bazar, Bangladesh. This study examines the attitudes toward physical abuse and experiences of intimate partner violence (IPV) of Rohingya refugee women who experienced child marriage. A cross-sectional survey was conducted in the Rohingya refugee settlement at Cox's Bazar, Bangladesh. Attitudes towards physical abuse have been assessed by a set of five questions that asked the situation under which 'hitting or beating' one's wife is justifiable. Multivariable logistic regressions are used to examine the associations of exposure to child marriage with (i) attitudes towards the justification of physical abuse by one's husband and (ii) experiences of IPV in the 12 months prior to the survey. Data are available for 486 participants. Overall, 61.32% of women experienced child marriage (married before 18 years of age) and they were more likely to have strongly justified beatings/hitting one's wife under certain circumstances (Adjusted Odds Ratio (AOR) = 2.71; 95%CI: 1.78, 4.11), and to have experienced such IPV by their husbands in the 12 months prior to the survey (AOR = 1.72; 95%CI: 1.13, 2.61). These AORs are higher for women married at ages 12-14 than those married at 15-17. Having some formal education among husband and wife is protective of abuse within a marriage. Rohingya women's attitudes towards and experiences of IPV are associated with their exposure to child marriage. Interventions for stopping child marriage, marriage registration, social support group, and legal interventions are needed. Offering formal education to all children needs to be prioritized.

Radionuclides Transfer from Soil to Tea Leaves and Estimation of Committed Effective Dose to the Bangladesh Populace.

Considering the probable health risks due to radioactivity input via drinking tea, the concentrations of 226Ra, 232Th,40K and 137Cs radionuclides in the soil and the corresponding tea leaves of a large tea plantation were measured using high purity germanium (HPGe) γ-ray spectrometry. Different layers of soil and fresh tea leaf samples were collected from the Udalia Tea Estate (UTE) in the Fatickchari area of Chittagong, Bangladesh. The mean concentrations (in Bq/kg) of radionuclides in the studied soil samples were found to be 34 ± 9 to 45 ± 3 for 226Ra, 50 ± 13 to 63 ± 5 for 232Th, 245 ± 30 to 635 ± 35 for 40K and 3 ± 1 to 10 ± 1 for 137Cs, while the respective values in the corresponding tea leaf samples were 3.6 ± 0.7 to 5.7 ± 1.0, 2.4 ± 0.5 to 5.8 ± 0.9, 132 ± 25 to 258 ± 29 and <0.4. The mean transfer factors for 226Ra, 232Th and 40K from soil to tea leaves were calculated to be 0.12, 0.08 and 0.46, respectively, the complete range being 1.1 × 10-2 to 1.0, in accordance with IAEA values. Additionally, the most popularly consumed tea brands available in the Bangladeshi market were also analyzed and, with the exception of 40K, were found to have similar concentrations to the fresh tea leaves collected from the UTE. The committed effective dose via the consumption of tea was estimated to be low in comparison with the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) reference ingestion dose limit of 290 µSv/y. Current indicative tea consumption of 4 g/day/person shows an insignificant radiological risk to public health, while cumulative dietary exposures may not be entirely negligible, because the UNSCEAR reference dose limit is derived from total dietary exposures. This study suggests a periodic monitoring of radiation levels in tea leaves in seeking to ensure the safety of human health.

Access to female contraceptives by Rohingya refugees, Bangladesh.

OBJECTIVE: To determine the prevalence of the use of contraceptives among female Rohingya refugees in Bangladesh and its associated factors. METHODS: We conducted our cross-sectional survey at the Kutupalong refugee facility located in Cox's Bazar in November 2019. We used univariable and multivariable logistic regression models to determine the association between the use of contraceptives and our various predictor variables, including women's age, age at first marriage, education level and employment status. We also considered factors such as whether previous pregnancies were planned or unplanned, and the occurrence of non-consensual sex with husbands. FINDINGS: We found that 50.91% (251/493) of the survey participants used contraceptives, and that injection (169/251; 67.33%) and oral contraceptives (75/251; 29.88%) were the predominant modes. Of the women who did not use contraceptives, the main reasons were reported as disapproval by husbands (118/242; 48.76%), actively seeking a pregnancy (42/242; 17.36%) and religious beliefs (37/242; 15.29%). An increased likelihood of using contraceptives was found to be positively associated with women's employment outside their households (odds ratio, OR: 3.11; 95% confidence interval, CI: 1.69-6.11) and the presence of a health-care centre in the camp (OR: 3.92; 95% CI: 2.01-7.67). Women who reported an unplanned pregnancy during the previous 2 years were less likely to use contraceptives (OR: 0.02; 95% CI: 0.01-0.05). CONCLUSION: To increase the acceptance and use of contraceptives, we recommend programmes targeted at women of reproductive age and their husbands, religious and community leaders, and providers of family planning and child and maternal health-care services.

Risks of COVID19 outbreaks in Rohingya refugee camps in Bangladesh.

The COVID-19 pandemic was confirmed to have started spreading in Bangladesh since March 2020. Since then the new infections grew exponentially and now the rate is highest in Asia along with wider community-level transmission. In Bangladesh, the preventive measures have been found challenging to implement due to a lack of general awareness of COVID-19 and the absence of a social safety net. In this situation, there is a concern about the heightened risk of infection and its aftermath in Rohingya refugee camps in the southwest part of Bangladesh, where the world's largest refugee population resides. If COVID-19 starts spreading in the camps, there will have a devastating consequence given that almost one million people live in precarious and unhygienic conditions in an area of only five square kilometres. In this paper, the risk for the Rohingya refugee population of getting COVID-19 disease and the preparedness to diagnose new cases and their management by the facilities of government and international organizations are discussed. Several suggestions are also offered to protect the Rohingya refugee population from deadly COVID-19 disease.

Assessment of radionuclides in the soil of residential areas of the Chittagong metropolitan city, Bangladesh and evaluation of associated radiological risk.

Soil samples from the three residential hubs of Chittagong city, Bangladesh were analyzed using gamma spectrometry to estimate radiation hazard due to natural radioactive sources and anthropogenic nuclide (137)Cs. The activity concentration of (226)Ra was found to be in the range 11-25 Bq.kg(-1), (232)Th in the range 38-59 Bq.kg(-1) and (40)K in the range 246-414 Bq.kg(-1). These results were used to calculate the radiological hazard parameters including Excess of Lifetime Cancer Risk (ELCR). The estimated outdoor gamma exposure rates were 40.6-63.8 nGy.h(-1). The radiation hazard index (radium equivalent activity) ranged from 90-140 Bq.kg(-1). The average value of the ELCR was found to be 0.21 × 10(-3), which is lower than the world average. Sporadic fallout of (137)Cs was observed with an average value of 2.0 Bq.kg(-1).

Socioeconomic and Demographic Disparities in Knowledge of Reproductive Healthcare among Female University Students in Bangladesh.

BACKGROUND: Reproductive health (RH) is a critical component of women's health and overall well-being around the world, especially in developing countries. We examine the factors that determine knowledge of RH care among female university students in Bangladesh. METHODS: Data on 300 female students were collected from Rajshahi University, Bangladesh through a structured questionnaire using purposive sampling technique. The data were used for univariate analysis, to carry out the description of the variables; bivariate analysis was used to examine the associations between the variables; and finally, multivariate analysis (binary logistic regression model) was used to examine and fit the model and interpret the parameter estimates, especially in terms of odds ratios. RESULTS: The results revealed that more than one-third (34.3%) respondents do not have sufficient knowledge of RH care. The χ (2)-test identified the significant (p < 0.05) associations between respondents' knowledge of RH care with respondents' age, education, family type, watching television; and knowledge about pregnancy, family planning, and contraceptive use. Finally, the binary logistic regression model identified respondents' age, education, family type; and knowledge about family planning, and contraceptive use as the significant (p < 0.05) predictors of RH care. CONCLUSIONS AND GLOBAL HEALTH IMPLICATIONS: Knowledge of RH care among female university students was found unsatisfactory. Government and concerned organizations should promote and strengthen various health education programs to focus on RH care especially for the female university students in Bangladesh.

Formation of high-resistance supported lipid bilayer on the surface of a silicon substrate with microelectrodes.

We have developed two basic technologies for fabrication of supported planar lipid bilayer membrane ion channel biosensors: a defect-free lipid bilayer formation on the substrate surface with electrode pores and a patterning technique for the hydrophobic self-assembled-monolayer to form the guard ring that reduces the lipid bilayer edge-leak current. The importance of the supported-membrane structure to achieve low noise and high-speed performance is suggested on the basis of the observed relation between the single-ion-channel current noise and the pore size.