Body Ventilation System

The Body Ventilation System (BVS) developed by GlobalSecure Safety Corporation uses a battery powered blower to circulate air through an air distribution device worn under the soldier s body armour. As fresh air is circulated beneath the IBA and battle dress uniform (BDU), natural body cooling is retained, resulting in improved physiology. 

Several hundred victims undress out of doors when the weather permitted, otherwise in the mortuary victims walk to the gas chamber [passing heaps of corpses from the last batch which are awaiting their cremation..Zyklon B is thrown in through input hatches, from a ladder after 15 to 20 minutes the doors are opened bodies are removed to the mortuary or outside to the burning pits behind crematorium V, while the workers sometimes do and sometimes do not wear gas masks [which would be fatal, since no ventilation system reduces the HCN concentration]. According to Pressac, the number of victims is difficult to estimate, presumably approximately 100,000 each.125 The same goes for Bunkers I and II. 

The thermal environment is sometimes very complex. Convection, radiation and conduction are the common means of heat exchange and they vary independently over time and location. The final effects on the surface heat exchange of the human body are important factors for heat balance and for perception of the thermal conditions. Assessment of the thermal environment in a modern office or a car can create difficulties due to the complex interaction of the ventilation system with the situation close to the person and the external, environmental factors (e.g. radiation, air temperature and air movements). Furthermore, measurements in reality, as well as in the laboratory, contain various methodological problems. In this chapter some important aspects of dynamic water vapour and heat transport through fabrics are discussed. 

Gob-side entry retaining working face realized Y type ventilation system. Gas comprehensive control technology, burying pipes in filling body and inclined bed plate tunnel, improved the gas... 

The most common sensor is the activity sensor, which uses any of a variety of technologies (e.g., piezoelectric crystals and accelerometers) to detect body movement. Systems using a transthoracic-impedance sensor to estimate pulmonary minute ventilation or cardiac contractility are also commercially available. Numerous other sensors (e.g., stroke volume, blood temperature or pH, oxygen saturation, and right ventricular pressure) have been researched or market-released at various times. Some systems are dual-sensor, combining the best features of each sensor in a single pacing system. 

The criteria that a facility must satisfy to qualify for singic-contingepcy, operation are based on the radiation dose that might result from an accidental criticality The shielding and the ventilating system of an acceptable facility must. be such that the whole body radiation dose received by an individual located at any point outside the shield will not exceed 25 rem (Ref 1) following a criticality accident. (This may be compared to fatal doses, estimated... 

Before embarking upon the design for a ventilation system, it is necessary to assess the extent of the problem, that is, the amount of airborne pollution to be encoimtered in a workplace, and/or the degree of discomfort or stress expected from a thermal environment. Measmement and analysis techniques need to be devised and criteria and standards applied to the environment imder consideration. Where measurement and analysis are concerned, the physics and the chemistry of the properties of the pollutant and its mode of emission need to be studied in such a way that a reliable and accmate assessment of the exposure of a worker can be made. As far as criteria and standards are concerned, medical evidence, biological research and epidemiological methods need to be applied to establish the relationship between the exposure and the long- and short-term effect upon the human body of the worker taking into account the duration of exposure and the work rate. It can be seen, therefore, that many scientific skills... 

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