ATR-FTIR study of bacteria and proteins on the bare and coated ZnSe internal reflection element

Transparent; polyimides; bis(ester anhydride); cyclohexan

Determining total N deposition in a winter wheat and maize cropping system

Atmospheric N deposition is a serious problem in the North China Plain (NCP) because it imposes a considerable nutrient burden on the surrounding environment. A manual integrated total N input (ITNI) method was developed using 15N-labelled monitor plants grown in pots to obtain accurate measures of total N deposition to the agroecosystems in the NCP and improve N-fertilizer recommendations. Total airborne N input into the maize-wheat rotation system is 80-90 kg N ha-1 yr-1 in the NCP, and the plant available N from deposition for maize and wheat plants is c. 50 kg N ha-1 yr-1. While total airborne N input is measured at almost 100 kg N ha-1 yr-1 when ryegrass is used as the monitoring plant, and the plant available N from deposition for ryegrass is c. 76 kg N ha-1 yr-1, accounting for 77% of the total N deposition. Dry deposition is likely to be the major contributor to the total N deposition during wheat growing season in the dry and dusty NCP

Determining total N deposition in a winter wheat and maize cropping system

Atmospheric N deposition is a serious problem in the North China Plain (NCP) because it imposes a considerable nutrient burden on the surrounding environment. A manual integrated total N input (ITNI) method was developed using 15N-labelled monitor plants grown in pots to obtain accurate measures of total N deposition to the agroecosystems in the NCP and improve N-fertilizer recommendations. Total airborne N input into the maize-wheat rotation system is 80-90 kg N ha-1 yr-1 in the NCP, and the plant available N from deposition for maize and wheat plants is c. 50 kg N ha-1 yr-1. While total airborne N input is measured at almost 100 kg N ha-1 yr-1 when ryegrass is used as the monitoring plant, and the plant available N from deposition for ryegrass is c. 76 kg N ha-1 yr-1, accounting for 77% of the total N deposition. Dry deposition is likely to be the major contributor to the total N deposition during wheat growing season in the dry and dusty NCP

ATR-FTIR study of Bacillus sp. and Escherichia coli settlements on the bare and Al2O3 coated ZnSe internal reflection element

ATR-FTIR study of Bacillus sp. and Escherichia coli settlements on the bare and Al2O3 coated ZnSe internal reflection elemen

ATR-FTIR study of Bacillus sp. and Escherichia coli settlements on the bare and Al2O3 coated ZnSe internal reflection element

ATR-FTIR study of Bacillus sp. and Escherichia coli settlements on the bare and Al2O3 coated ZnSe internal reflection elemen

The stress characteristics of plate-fin structures at the different operation parameters of LNG heat exchanger

In this paper, the stresses of plate-fin structures at the different operation parameters were analyzed in actual operation process of LNG plate-fin heat exchanger based on finite element method and thermal elastic theory. Stress characteristics of plate-fin structures were investigated at the different operation parameters of that. The results show that the structural failure of plate-fin structures is mainly induced by the maximum shear stress at the brazing filler metal layer between plate and fin while by the maximum normal stress in the region of brazed joint near the fin side. And a crack would initiate in brazed joint near the fin side. The maximum normal stress is also main factor to result in the structural failure of plate-fin structures at the different temperature difference (between Natural Gas (NG) and Mixture Refrigerant (MR)), MR temperature and NG pressure of LNG heat exchanger. At the same time, the peak stresses obviously increase as the temperature difference, MR temperature and NG pressure increase. These results will provide some constructive instructions in the safe operation of LNG plate-fin heat exchanger in a large-scale LNG cold-box

The stress characteristics of plate-fin structures at the different operation parameters of LNG heat exchanger

In this paper, the stresses of plate-fin structures at the different operation parameters were analyzed in actual operation process of LNG plate-fin heat exchanger based on finite element method and thermal elastic theory. Stress characteristics of plate-fin structures were investigated at the different operation parameters of that. The results show that the structural failure of plate-fin structures is mainly induced by the maximum shear stress at the brazing filler metal layer between plate and fin while by the maximum normal stress in the region of brazed joint near the fin side. And a crack would initiate in brazed joint near the fin side. The maximum normal stress is also main factor to result in the structural failure of plate-fin structures at the different temperature difference (between Natural Gas (NG) and Mixture Refrigerant (MR)), MR temperature and NG pressure of LNG heat exchanger. At the same time, the peak stresses obviously increase as the temperature difference, MR temperature and NG pressure increase. These results will provide some constructive instructions in the safe operation of LNG plate-fin heat exchanger in a large-scale LNG cold-box