Simulation and analysis of airflow stability during fire in mine belt roadway

According to fluid dynamics analysis during the fire, the criteria k-ε two-equation model for solving three-dimensional turbulence was determined, the pollutants generated in the fire disaster were set by adopting Mixture multiphase flow, and the SIMPLE algorithm was used for solving on the basis of comprehensive consideration on the heat radia- tion and components transmission during fire. By simulating the airflow flowing state inside the tunnel during fire disaster of downward ventilation, drift ventilation, and ascensional ventilation, respectively, with regard to the actual situation of No.l, No.3, and No.5 belt roadway in Kongzhuang Coal Mine, the velocity vector distributions of pollutants under different inlet air volumes were obtained, and the damage degree and influential factors of disaster were also clear, which is helpful to control and avoid disaster during belt roadway fire.

Psychological Problems after Stroke and Their Management: State of Knowledge

Background: Stroke has the greatest disabling impact of any chronic disease. Psychological changes including emotional, behavioural and cognitive changes can be common after stroke. Recently more attention has been given to these concerns. Content: This paper considers the nature of these problems, how they can be identified and the evidence for effective interventions. Conclusions: Research is needed into instruments to better identify anxiety after stroke and into treatments for emotional and behavioural changes. Further work is also needed to establish the best means for identifying cognitive deficits after stroke, particularly executive and memory problems, and into the optimal means of ameliorating these deficits.

A Very Compact Circular Adaptive Array for New Generation Mobile Commercial Receivers

The antenna is a receiver’s component that collects electromagnetic waves from various directions. The rationale behind focusing on the circular array is that its tuning ensures that the receiver processes the desired signal only, while rejecting the unwanted interference. This can only be achieved by a directional external antenna that is large in size and must be steered mechanically in the desired direction. As this arrangement is not practical, smart antennae have been proposed as an alternative. A circular phased array can produce a predicted radiation pattern, whereby it receives maximum energy from the desired direction without the need for mechanical control. Owing to these characteristics, phased arrays exhibit high gain as well as immunity to interference, making them ideal for use in high interference environments. This combination would ensure that it could be incorporated into a commercial deck receiver or installed on vehicles.

A Very Compact Normal Mode Multiloop Helical Antenna with Enhanced Bandwidth

The physical size of an antenna becomes an important characteristic when receiving signals in bands with long wavelengths. Size determines two important aspects of antenna performance;impedance and efficiency. For example, the VHF antennas installed on radio sets that intended to receive FM or the latest technology Digital Audio Broadcasting (DAB) radio signals in Bands II, III respectively. Antennas that are installed on mobile platforms (i.e. portable receivers) require a receiver that utilizes a whip telescopic antenna with adjustable length which can operate as a λ/4 monopole antenna. Whereas, non-portable applications like a deck commercial receiver has no built in antenna due to the large size of the radiator needed and so must be connected with an external antenna. This paper presents a new design of a very small size Normal Mode Multiloop Helical Antenna (NMMHA) with superior performance developed for commercial receivers operate in band II, III. The major drawback which has been overcome with this design is the very narrow bandwidth of the Normal Mode Helical Antenna, which originally was optimized to provide the minimum Voltage Standing Wave Ratio VSWR response across Band II (87.5 - 108 MHz). The NMMHA’s size allows it to be a build in block of a deck commercial receiver.

成功治疗不孕后母亲自尊心的变化

Objective: To [1] investigate self-esteem during pregnancy after previous infertility and [2] establish the relationship among self-esteem, anxiety during pregnancy, and parenting self-efficacy. Design: Limited prospective study. Setting: A regional infertility clinic and antenatal clinic. Patient(s): Seventy women who had conceived through assisted reproductive technology and 111 women who had conceived naturally. Intervention(s): Measures of self-esteem, anxiety, and parenting self-efficacy. Main Outcome Measure(s): Self-esteem, anxiety, and parenting self-efficacy. Result(s): Women who had conceived through IVF treatment did not differ in terms of self-esteem during pregnancy from those who had conceived naturally. All of the women in the present study displayed levels of self-esteem that were within the normal range. Self-esteem increased as pregnancy progressed. Self-esteem was negatively correlated with anxiety during pregnancy. As self-esteem increased, anxiety decreased. Self-esteem at the start of pregnancy (18 weeks) and anxiety in the early stages of parenthood (6 weeks postpartum) predicted parenting self-efficacy. Conclusion(s): Self-esteem in the early stages of pregnancy, for both women who conceived through IVF and women who conceived naturally, is related to self-reported levels of parenting efficacy. Coaching and mentoring through antenatal clinics in the early stages of pregnancy should be tailored to incorporate advice regarding self-esteem in addition to management of pregnancy and psychological well-being.