Experimental Analysis on Optimal Tail Water Discharge Method of River Water Source Heat Pump

In order to study the influence on water temperature raise of river water source heat pump tail water discharged in different methods, the real sensor network is established by using digital temperature sensors. The simulation experiments of different discharging methods of river water source heat pump are carried out, including submerged-type discharge, surface-type discharge and jet-type discharge with 12 effluent ways. By using weighted average method, the preferred values of such factors as the average temperature raise,the temperature raise variance, the biggest temperature raise value, and the number of temperature measure points above the temperature raise average value are calculated. Moreover, the experiment results are analyzed by the three-dimensional figures of water temperature raise, which shows that jet-type discharge is better than submerged-type discharge and surface-type discharge,and the double-port way is better than single-port way. In addition, the double-port way along with the current in surface-type discharge method is the one that exerts least influence on river water temperature raise.     

酸性电解水对冰鲜鸽保鲜效果的研究

以刚宰杀急速冷却的鸽子为研究对象,用酸性电解水处理后进行0~4 ℃冷藏保鲜,通过测定鸽肉的pH、挥发性盐基氮（TNB-N）含量、菌落总数、汁液流失率及感官评价等指标,研究酸性电解水电解时间、浸泡时间及pH对冰鲜鸽保鲜效果的影响。结果表明：酸性电解水能有效抑制冰鲜鸽肉中微生物的生长繁殖,在一定程度延缓TNB-N含量、汁液流失率、pH的上升。在0~4 ℃冷藏条件下,对照组鸽肉可以保存5 d,经pH 2.65的酸性电解水浸泡15~20 min后的鸽肉能保存7~9 d,延长了2~4 d的保质期。     

A Predictive Method of Index on Power Consumption in a Resident Unit

In this paper, a series of data on power consumption and the numbers of household appliance in a resident unit of a district, were analyzed by regression technique. A curve of the index on power consumption of a resident unit in a district has been gained. This curve was tested by another series of data obtained at the same time.     

The Indoor Experiment Study on Pore Water Pressure Increment and Dissipation of Saturated Sand Caused by Blasting

An indoor experiment on explosive compaction of saturated sand has been done.The changes of pore water pressure during blasting are measured and the laws of pore water pressure increment and dissipation are analyzed.It indicates that the processes of increment and dissipation of pore water pressure have particularity along the depth and radial.At the same time,the development rule of liquefaction under explosive loading is also analyzed;these conclusions obtained in the experiment,may provide some useful references for the engineering design and the theoretic study of explosive compaction for water-saturated granular foundation.     

Experimental Analysis of the Water Weaken Effect on Gravel Soil Roadbed Locating in the Reservoir Region with Different Compactedness

It is vital to get the accurate data of the shear strength parameters of gravel soil with different water content and compactedness before they conduct the stability analysis for gravel soil roadbed. Under several test conditions, a series of direct shear tests were performed by using some gravel soil samples obtained from a selected roadbed which is under the influence of water level fluctuation. The corresponding results show that the gravel soil cohesion increased as the water content of fine soil increases till it meets its peak value, then it will decrease as the water content keeps increase. However, the internal friction angle will decrease slowly with the increase of water content of fine soil in the initial phase, and then it will decrease rapidly as the water content keeps increase. And on the other hand, the fitted shear strength parameters calculated from the test data has been influenced by the pre-load values that used to prepare soil samples, especially for the condition that the pre-load value less than the normal stress value applied in the direct shear test. All in all, the fitted shear parameters will be controlled by the relationship among water content, pre-load value and normal stress.