Theory or not theory? That is the question.

<p>Today, millions of bytes of data are generated in fractions of seconds, through sensors, network devices, web pages clicks and other sources. To handle this massive online data almost in real time is necessary to use scalable distributed systems whose components are fault tolerant, without compromising much performance.<br>The aim of this short course is to present this new class of distributed system and the challenges of its implementation for undergraduate and graduate students, or professionals interested in learning stream computing paradigm.</p

CONTROLLING NITRATE CONCENTRATIONS IN LARGE SEAWATER FACILITIES

Upravitelji velikih akvatorija gdje nema značajnije primarne proizvodnje i gdje su promjene vode nepraktične koriste biološku denitrifikaciju za kontrolu visokih koncentracija nitrata. Dva opisana sustava denitrifikacije u ovom radu funkcioniraju na različite načine: Sustav Živo more (Living Sea) koristi se serijskim sustavom (batch-system), dok državni akvarijum u New Jerseyu koristi protočni (flow-through) sustav. Brzina denitrifikacije kontrolira djelovanje sustava Living Sea, dok vremensko zadržavanje vode kontrolira rad sustava državnog akvarijuma New Jerseya.water changes are impractical have been using biological denitrification to control high nitrate concentrations. The two denitrification systems described in this study operate in different ways: the Living Seas uses a batch system, while the New Jersey State Aquarium uses a flow-through system. The rate of denitrification controls the operation of the Living Seas system, while water residence time controls the operation of the New Jersey State Aquarium system

Community-Based Intervention to Improve the Well-Being of Children Left Behind by Migrant Parents in Rural China

In rural China around 60 million left-behind children (LBC) experience prolonged separation from migrant worker parents. They are vulnerable to a range of psychosocial problems. The aim of this study was to determine whether a community-based intervention consisting of Children's Centres can improve psychosocial well-being and school performance of these children. The intervention was carried out in 20 villages, for children aged 7 to 15 years, irrespective of left-behind status. Nine hundred and twenty children, 438 LBC and 256 children living with parents (RC) attended the Centres. At follow-up after one year, there were improvements compared to baseline in total difficulties (measured with the Strengths and Difficulties Questionnaire) in children left behind by both parents (p = 0.009), children left behind by one parent (p = 0.008) and RC (p = 0.05). Postintervention school performance significantly improved in both categories of LBC (p < 0.001), but not RC (p = 0.07); social support score increased in both categories of LBC (p < 0.001) and RC (p = 0.01). Findings from interviews with key stakeholders were overwhelmingly positive about the impacts. With strong local leadership and community motivation, a low-cost intervention can improve children's psychosocial well-being in these settings. Allowing communities to adapt the model to their own situation fosters local ownership, commitment, with benefits for children, parents, carers, and communities

Relaxation in the Chinese Hukou System: Effects on Psychosocial Wellbeing of Children Affected by Migration

The hukou household registration system in China is being relaxed in small and medium-sized cities, which makes it easier for migrant worker parents to take their children with them to cities for work. The aim of this study was determine the potential impact on psychological well-being of this change for children by migration and hukou status. We conducted a cross-sectional survey using the Chinese version of the Strengths and Difficulties Questionnaire (SDQ) in urban and migrant schools in the capital, Hangzhou, and in schools in two rural counties of Zhejiang Province. Completed questionnaires were obtained from 2965 children, aged 10 to 15: 867 urban children with urban hukou, 625 migrant children with rural hukou, 695 rural children with rural hukou living with parents, and 778 left behind children. The crude SDQ scores showed that children directly affected by migration (migrant children and left behind children) were most at risk of psychological problems; urban and rural children living with their parents in their accustomed environment were least vulnerable. After adjustment for confounders, migrant children were the most vulnerable to psychological problems. Given that migration with children is on the increase, efforts should be made to improve conditions in urban areas for these children, and especially to ensure access to urban public schools

Long-term impacts of parental migration on Chinese children’s psychosocial well-being: mitigating and exacerbating factors

PURPOSE: Prolonged separation from migrant parents raises concerns for the well-being of 60 million left behind children (LBC) in rural China. This study aimed to investigate the impact of current and previous parental migration on child psychosocial well-being, with a focus on emotional and behavioral outcomes, while considering factors in family care and support. METHODS: Children were recruited from schools in migrant-sending rural areas in Zhejiang and Guizhou provinces by random stratified sampling. A self-administered questionnaire measured children’s psychosocial well-being, demographics, household characteristics, and social support. Multiple linear regression models examined the effects of parental migration and other factors on psychosocial difficulties. RESULTS: Data from 1930 current, 907 previous, and 701 never LBC were included (mean age 12.4, SD 2.1). Adjusted models showed both previous and current parental migration was associated with significantly higher overall psychosocial difficulties, involving aspects of emotion, conduct, peer relationships, hyperactivity, and pro-social behaviors. Parental divorce and lack of available support demonstrated a strong association with greater total difficulties. While children in Guizhou had much worse psychosocial outcomes than those in Zhejiang, adjusted subgroup analysis showed similar magnitude of between-province disparities regardless of parental migration status. However, having divorced parents and lack of support were greater psychosocial risk factors for current and previous-LBC than for never LBC. CONCLUSIONS: Parental migration has an independent, long-lasting adverse effect on children. Psychosocial well-being of LBC depends more on the relationship bonds between nuclear family members and the availability of support, rather than socioeconomic status