A single-board preprocessor and pulse generator

The Aeronomy Lab. of NOAA has designed and built a single board, programmable radar controller for use with VHF ST (stratosphere troposphere) radars. The controller consists of a coherent integrator preprocessor and a radar pulse generator, both of which are described, as well as interfaces to an antenna beam switch and a receiver bandwidth switch. The controller occupies a single slot in a Data General Nova of Eclipse computer. The integrator and pulse generator take advantage of high density, dual port FIFO chips such as the 512 x 9 Mostek MK 4501. These FIFOs have separate input and output ports and independent read and write cycles with cycle times of less than 200 ns, making them very fast and easy to interface. A simple block diagram of the coherent integrator is shown. The integrator is designed to handle inputs from one receiver (2 channels) with 1 sec sample spacing. The pulse generator is based on controllers designed by R. F. Woodman for the Arecibo and SOUSY radars us a recirculating memory scheme

Unpredictable Needs are Associated with Lower Expectations of Repayment

Sometimes people help one another expecting to be repaid, while at other times people help without an expectation of repayment. What might underlie this difference in expectations of repayment? We investigate this question in a nationally representative sample of US adults (N = 915), and find that people are more likely to expect repayment when needs are perceived to be more predictable. We then replicate these findings in a new sample of US adults (N = 417), and show that people have higher expectations of repayment when needs are perceived to be more predictable because people assign greater responsibility to others for experiencing such predictable needs (e.g., needing money for utilities). This is consistent with previous work based on smaller-scale societies, which shows that the predictability of needs influences expectations of repayment. Our results also add to this previous work by (1) showing that the positive relationship between predictability of needs and expectations of repayment previously found in smaller-scale communities is generalizable to the US population, and (2) showing that attributions of responsibility partially mediate this relationship. This work shows that the predictability of needs and attributions of responsibility for that need are important factors underlying the psychology of helping in times of need

Support during birth interacts with prior trauma and birth intervention to predict postnatal post-traumatic stress symptoms

Background: Many women experience childbirth as traumatic and 2% develop post-traumatic stress disorder (PTSD). This study examined the role of health practitioner support and personal control during birth as predictors of PTS symptoms, adjusting for vulnerability factors of prior trauma, depression, control beliefs and birth intervention. It also investigated interactions between support, prior trauma and birth intervention and their association with PTS symptoms. Methods: A prospective longitudinal survey of 138 women recruited from UK NHS maternity clinics. Measures were taken in pregnancy, three-weeks and three-months after the birth. Results: Support and control during birth were not predictive of postnatal PTS symptoms. However, support was predictive of PTS symptoms in a subset of women with prior trauma (beta = -.41, R2 = 16%) at both three-weeks and three-months postpartum. The interaction of birth intervention and support was associated with PTS symptoms three-months after birth, the relationship between support and PTS symptoms was stronger in women experiencing more intervention. Conclusions: Low support from health practitioners is predictive of postnatal PTS symptoms in women who have a history of trauma. Longer-term effects of low support on postnatal PTS symptoms are also found in women who had more intervention during birth

Haze in the Klang Valley of Malaysia

Continuous measurements of dry aerosol light scattering (Bsp) were made at two sites in the Klang Valley of Malaysia between December 1998 and December 2000. In addition 24-h PM2.5 samples were collected on a one-day-in-six cycle and the chemical composition of the aerosol was determined. Periods of excessive haze were defined as 24-h average Bsp values greater than 150 Mm-1 and these occurred on a number of occasions, between May and September 1999, during May 2000, and between July and September 2000. The evidence for smoke being a significant contributor to aerosol during periods of excessive haze is discussed and includes features of the aerosol chemistry, the diurnal cycle of Bsp, and the coincidence of forest fires on Sumatra during the southwest (SW) monsoon period, as well as transport modelling for one week of the southwest Monsoon of 2000. The study highlights that whilst transboundary smoke is a major contributor to poor visibility in the Klang Valley, smoke from fires on Peninsular Malaysia is also a contributor, and at all times, the domestic source of secondary particle production is present

How the COVID-19 Pandemic Highlights the Effects of Genetic Conflict During Pregnancy

Pregnancy is often viewed as a cooperative endeavor between mother and fetus. However, biologists have documented that under the surface, pregnancy is better characterized as a time where genetic conflict between maternal and paternal genes over fetal development can run rampant. While genetic conflict is a typical aspect of pregnancy, uncontrolled genetic conflict has the potential to result in pregnancy complications for both the mother (e.g., miscarriage, stillbirth, preterm birth) and the fetus (e.g., intrauterine growth restrictions, low birth weight). But, unexpectedly, the COVID-19 pandemic has presented researcher with a case study to investigate genetic conflict during pregnancy. Specifically, medical doctors noted changes in the frequency of pregnancy complications (e.g., premature births, miscarriages, stillbirths) theorized to be influence by genetic conflict. As the biology of these complications did not change during the pandemic, we wanted to investigate potential behavioral changes that influenced the expression of genetic conflict in pregnancy complications using archival data. Understanding these relationships can elucidate how cultural and behavioral changes influence biological processes such as the occurrence of pregnancy complications

Applying Leventhal's self-regulatory model to pregnancy: Evidence that pregnancy-related beliefs and emotional responses are associated with maternal health outcomes

This study explored whether women’s beliefs about, and emotional responses to, pregnancy could account for variations in maternal mental and physical health outcomes, using the self-regulatory model as a theoretical framework. Women in the last trimester of pregnancy (N = 408) completed an online survey including measures of representations of pregnancy, coping, and physical and mental health. Results revealed that representations of pregnancy accounted for up to 30 and 39 per cent of the variance in indicators of physical and mental health, respectively. Findings suggest that beliefs about pregnancy may have important implications for maternal health

The City MISS: development of a scale to measure stigma of perinatal mental illness

Objective: This study aimed to develop and validate a scale to measure perceived stigma for perinatal mental illness in women. Background: Stigma is one of the most frequently cited barriers to seeking treatment and many women with perinatal mental illness fail to get the treatment they need. However, there is no psychometric scale that measures how women may experience the unique aspects of perinatal mental illness stigma. Method: A draft scale of 30 items was developed from a literature review. Women with perinatal mental illness (n = 279) were recruited to complete the City Mental Illness Stigma Scale. Concurrent validity was measured using the Internalised Stigma of Mental Illness Scale. Factor analysis was used to create the final scale. Results: The final 15-item City Mental Illness Stigma Scale has a three-factor structure: perceived external stigma, internal stigma and disclosure stigma. The scale accounted for 54% of the variance and had good internal reliability and concurrent validity. Conclusion: The City Mental Illness Stigma Scale appears to be a valid measure which provides a potentially useful tool for clinical practice and research in stigma and perinatal mental illness, including assessing the prevalence and characteristics of stigma. This research can be used to inform interventions to reduce or address the stigma experienced by some women with perinatal mental illness

A Thematic Analysis of Stigma and Disclosure for Perinatal Depression on an Online Forum.

BACKGROUND: Perinatal mental illness is a global health concern; however, many women do not get the treatment they need to recover. Some women choose not to seek professional help and get no treatment because they feel stigmatized. Online forums for various health conditions, including perinatal mental health, can be beneficial for members. Little is known about the role that online forums for perinatal mental illness play in reducing stigma and subsequent disclosure of symptoms to health care providers and treatment uptake. OBJECTIVE: This study aimed to examine stigma and disclosure in forums and describe any potential disadvantages of forum use. METHODS: An online forum for mothers was examined and 1546 messages extracted from 102 threads from the antenatal and postnatal depression section. These messages were subjected to deductive systematic thematic analysis to identify common themes regarding stigma and disclosure of symptoms and potential disadvantages of forum use. RESULTS: Two major themes were identified: stigma and negative experiences of disclosure. Stigma had 3 subthemes: internal stigma, external stigma, and treatment stigma. Many women were concerned about feeling like a "bad" or "failed" mother and worried that if they disclosed their symptoms to a health care provider they would be stigmatized. Posts in response to this frequently encouraged women to disclose their symptoms to health care providers and accept professional treatment. Forum discourse reconstructed the ideology of motherhood as compatible with perinatal mental illness, especially if the woman sought help and adhered to treatment. Many women overcame stigma and replied that they had taken advice and disclosed to a health care provider and/or taken treatment. CONCLUSIONS: Forum use may increase women's disclosure to health care providers by challenging their internal and external stigma and this may strengthen professional treatment uptake and adherence. However, a few posts described negative experiences when disclosing to health care providers

Risk perception and choice of place of birth in women with high risk pregnancies: A qualitative study

Objective: To examine the perception of risk among a group of women with high risk pregnancies who were either planning to give birth in hospital, or at home despite medical advice to the contrary. The intention was to consider differences and similarities between the groups to examine how perception of risk relates to choice of place of birth. Design: Qualitative study using semi-structured interviews. Setting Maternity department in a hospital in South East England. Participants Twenty-six women with high risk pregnancies, at least 32 weeks pregnant. Half were planning hospital births and half homebirths. Measurements and findings: Semi-structured interviews to investigate women's understanding and assessment of risk. Results were analysed using thematic analysis. Five themes emerged: understanding of situation; judgement of risk; reassuring factors; impact of risk; and coping with risk. Women from both groups had some understanding of the implications of their medical/obstetric conditions. They displayed concerns about their babies' wellbeing. Women planning homebirths assessed their risks as lower and expressed less concerns than women planning hospital births. Women planning hospital births more frequently described following professional advice. Key conclusions: Risk perception is individual and subjective. Women with high risk pregnancies who plan to give birth at home perceive risk differently to women who plan hospital births. Implications for practice: Healthcare professionals working with women with high risk pregnancies should be aware of the potential for differences in definitions and perceptions of risk within this group