The IVAIRE project – a randomized controlled study of the impact of ventilation on indoor air quality and the respiratory symptoms of asthmatic children in single family homes

A randomized controlled trial was carried out to measure the impact of an intervention on ventilation, indoor air contaminants, and asthma symptoms of children. Eighty‐three asthmatic children living in low‐ventilated homes were followed over 2 years. Several environmental parameters were measured during the summer, fall, and winter. The children were randomized after Year 1 (43 Intervention; 40 Control). The intervention included the installation of either a Heat Recovery Ventilator (HRV) or Energy Recovery Ventilator (ERV). During the fall and winter seasons, there was a significant increase in the mean ventilation rate in the homes of the intervention group. A statistically significant reduction in mean formaldehyde, airborne mold spores, toluene, styrene, limonene, and α‐pinene concentrations was observed in the intervention group. There was no significant group difference in change in the number of days with symptoms per 14 days. However, there was a significant decrease in the proportion of children who experienced any wheezing (≥1 episode) and those with ≥4 episodes in the 12‐month period in the intervention group. This study indicates that improved ventilation reduces air contaminants and may prevent wheezing. Due to lack of power, a bigger study is needed.     

Respiratory allergies on the staff of the police force

The aim of the study was to evaluate respiratory allergies of an occupational nature in the staff of the police force. Five hundred and eighty-five subjects were submitted for lung function tests by dynamic spirometry. Subjects with a history of respiratory symptoms and border line respiratory function underwent bronchial provocation tests with methacholine. If FEV1 was < 80%, a bronchial reversibility test was performed. Allergic tests (skin and RAST) for inhalating allergens (perennial, seasonal and occupational) were performed. The results suggested asthmatic symptoms in 57 subjects, eight of whom were positive to skin and RAST tests for occupational inhalating allergens. Among these eight subjects, three had FEV1 < 80% of the theoretical value without therapy, and five showed obstruction of small caliber airways (MEF 25, MEF 50, FEF 25-75 < 65% of the theoretical value). The analysis showed a low percentage of respiratory occupational allergies. Among 21 subjects positive to Dermatophagoides, seven worked as archivists. In these workers, a concomitant occupational cause for the symptomatological and functional pattern was established.     

浅析计算机病毒防治及故障维护

21世纪,随着信息科技时代的到来,计算机社会被各行业、各领域广泛运用。因此探讨计算机的维护维修与病毒防治对帮助人们生活、工作有着重要的意义。基于此种目的,文章探讨了计算机的维护维修要点和病毒防治措施,希望能够为从事和关注计算机维护维修与病毒防治的人们提供一点借鉴。     

调质钢齿轮接触疲劳寿命试验最佳分布类型的分析

通过对６０ 对合金钢调质齿轮的接触疲劳寿命试验的分析处理,得出了齿轮的３ 种随机变量（ 寿命,强度,应力） 最佳分布类型和可能分布类型。为齿轮进行高可靠性精确设计提供了基础和依据。     

Two Moldy Day-care Centers: a Follow-up Study of Respiratory Symptoms and Infections

Abstract The aim was to study the respiratory symptoms among children exposed to indoor air molds in a day-care environment in Finland. Two day-care centers with a mold problem and two reference day-care centers were included in the study and the health data of the children were collected with a follow-up study of two periods. A total of 229 children 3-7 years old attended the day-care centers. During the first follow-up period, the children in the two day-care centers with mold problems had a significantly increased risk of sore throat, purulent and non-purulent nasal discharge, nasal congestion, hoarseness and common cold. During the second follow-up period, a significantly increased risk of purulent nasal discharge, nasal congestion, hoarseness and cough was observed. Upper respiratory tract symptoms, at least once during the study period, were more prevalent among the children attending mold-problem day-care centers. The mold-exposed children had such symptoms repeatedly or the symptoms were prolonged. In conclusion, in the mold-problem day-care centers, overall morbidity for respiratory symptoms and for common cold increased in comparison with the reference day-care centers.     

硬盘的正确使用和维护

本文对合理使用和维护硬盘的意义作了分析,并运用实例介绍了多种使用和维护的方法,以保证硬盘高效工作,确保数据的安全性。     

The impact of programming paradigms on the efficiency of an individual-based simulation model

We look in detail at an individual-based simulation of the spread of barley yellow dwarf virus. The need for a very large number of individual plants and aphids along with multiple runs using different model parameters mean that it is important to keep memory and processor requirements within reasonable bounds. We present implementations of the model in both imperative and object-oriented programming languages, particularly noting aspects relating to ease of implementation and runtime performance. Finally, we attempt to quantify the cost of some of the decisions made in terms of their memory and processor time requirements.     

Sensory Responses To Environmental Tobacco Smoke From Tobacco-Burning And Tobacco-Heating Cigarettes

Sensory ratings, respiratory behavior and eye blink rate were recorded in 11 nonsmokers exposed to a no-smoking (CONTROL) condition or to environmental tobacco smoke (ETS) from one of three kinds of cigarettes: a Kentucky reference (1R4F), an ultra-low tar (ULT) and one that heats tobacco (TEST).For each two-hour session in a controlled-environment room, two smokers “puffed” unlit cigarettes, for the CONTROL condition, or smoked 16 cigarettes to generate ETS (sidestream plus exhaled mainstream smoke). Concentrations of nicotine and respirable suspended particles (RSP) observed with the 1R4F and ULT cigarettes were 10- to 20-fold higher than those typically found in field sampling studies of office and restaurant smoking environments. The ULT and TEST cigarettes resulted in ETS analyte concentrations that were 77-100% and O-56%, respectively, of those observed with 1R4E Sensory ratings (odor, irritation, annoyance, acceptability) with the two tobacco-burning cigarettes were similar and were much greater than those recorded for the TEST or CONTROL conditions which were, in turn, rated similarly. Respiratory parameters (respiratory rate, tidal volume, expiratory time), which generally failed to discriminate the TEST and CONTROL conditions, were altered during exposure to ETS from the 1R4F and, to a lesser extent, the ULT cigarette. Eye blink rate was not significantly altered by ETS from any of the cigarettes.     

HIV-associated prospective memory impairment increases risk of dependence in everyday functioning.

HIV infection is associated with impairments in prospective memory (ProM), an aspect of episodic memory that refers to the ability to execute a future intention, such as remembering to take a medication at a specific time. The current study sought to examine the relationship between HIV-associated ProM impairment and the successful management of instrumental activities of daily living (IADLs). In a cohort of 66 HIV-infected individuals, ProM accounted for a significant proportion of variance in self-reported IADL dependence, over and above that which was explained by retrospective memory and by current affective distress. Analysis of component cognitive processes revealed that the relationship between HIV-associated ProM deficits and IADL dependence was driven by impaired cue detection and by deficits in self-initiated intention retrieval. Results were not better explained by demographic factors, HIV disease severity, psychiatric comorbidity, or substance use. Collectively, these data support the potential incremental ecological validity of ProM as a predictor of dependence in IADLs among persons living with HIV infection. (PsycINFO Database Record (c) 2010 APA, all rights reserved)