Postmortem Interval Estimation Time from Algormortis Temperature of Rats Expressed by MARS Model Approach

Estimation of Postmortem is one of the challenges in forensic science. The aim of this study was to construct a MARS model of Postmortem interval estimation time (PMT) from algor mortis temperature in Rat. Sixteen healthy male rats (Rattus norvegicus), onemonth old and weigh 100 gram were randomly divided into two groups (eight/each group) and were acclimated respectively among the ambient room (temperature over 28ºC) and at the conditioning room (temperature over 20ºC). The animals then were sacrificed in two days (four rats/day for each divided room) then algor mortis by rectal temperature were recorded after death at 0 and 2,4,6,8, 10,12, 14,16, 18,20 till 22 h respectively. The MARS model is nonlinear regression but performed as a multilinier curve that can have splines fitting and be defined as function model Y = 35.321 + 1.253 * BF1 + 0.436 * BF2 - 1.319 * BF3; and on 20ºC condition room as Y = 29.980 + 1.354 * BF1 + 0.799 * BF2 - 1.347 * BF3. Therefore, performance model was comprised by multilinier curve, then function model of algor mortis on ambient room be defined into three PMT intervals i.e: 1)Y=37,94 -0.11*(0-2h) (p>0.00); 2) Y = 40.88 - 1.87* (2-6h) ( p<0.00) and 3) Y=30.82-0.09*(6-22h) (p<0.00) while on 20ºC condition room, was : 1)Y = 34.78-0.09* (0-2h) (p<0.00) ; 2) Y = 37.97-2.38* (2-6h) (p<0.00) and 3)Y = 25.36-0.04* 6-22 h (p>0.00). The acceleration of the declining algor mortis at conditioning room showed steeper than on ambient room at 2-6h PMT interval (ß : 2,38 vs 1,87). Postmortem Time Interval Estimation from Algormortis Temperature of Rats could be expressed by MARS Model. The pattern model of estimation comprised by multilinear curve with splines was fitted at both of the experimental rooms.Keywords : Postmortem time interval, algor mortis, MARS model estimation

Energy Analysis and Sunshade Strategy Research of Passive Public Buildings

Taking an example of a passive public construction project of building the research and development center in hebei province and based on dynamic analysis of energy consumption principle, this models passive public buildings and simulates energy consumption, it concludes cold index that construction demands in air conditioning season is 5.93W/m2 and 23.75W/m2 in heating season. Where in the condition of sunshade and opening lighting in part of air conditioning room when calculating the difference between the air-conditioning season building energy consumption, it shows that shading effect is more obvious in 13:00~15:00pm,and Saving rate is 0.72%.Experimental study on the above analysis provides reference to Passive public buildings energy-saving operation.