| 2 | A large-scale experimental simulator for natural gas hydrate recovery and its experimental applications显示文摘To facilitate the recovery of natural gas hydrate(NGH)deposits in the South China Sea,we have designed and developed the world's largest publicly reported experimental simulator for NGH recovery.This system can also be used to perform CO_(2) capture and sequestration experiments and to simulate NGH recovery using CH_(4)/CO_(2) replacement.This system was used to prepare a shallow gas and hydrate reservoir,to simulate NGH recovery via depressurization with a horizontal well.A set of experimental procedures and data analysis methods were prepared for this system.By analyzing the measurements taken by each probe,we determined the temperature,pressure,and acoustic parameter trends that accompany NGH recovery.The results demonstrate that the temperature fields,pressure fields,acoustic characteristics,and electrical impedances of an NGH recovery experiment can be precisely monitored in real time using the aforementioned experimental system.Furthermore,fluid production rates can be calculated at a high level of precision.It was concluded that(1)the optimal production pressure differential ranges from 0.8 to 1.0 MPa,and the wellbore will clog if the pressure differential reaches 1.2 MPa;and(2)during NGH decomposition,strong heterogeneities will arise in the surrounding temperature and pressure fields,which will affect the shallow gas stratum. | Yang Ge Qingping Li Xin Lv Mingqiang Chen Bo Yang Benjian Song Jiafei Zhao Yongchen Song | 2023 | Petroleum2023，9，4： | 0 |
| 3 | An automatically progressed computer-controlled simulated digestion system to predict digestible and metabolizable energy of unconventional plant protein meals for growing pigs显示文摘The objective of this experimentwas to develop a new computer-controlled simulated digestion system to predict the digestible energy(DE)and metabolizable energy(ME)of unconventional plant protein meals for growing pigs.Nine meals tested included 1 source of rapeseed meal,4 sources of cottonseed meal,2 sources of sunflower meal,and 2 sources of peanut meal.Twenty growing pigs(Duroc[LandraceLarge White])with an initial body weight(BW)of 41.7±2.6 kg were allotted to a replicated 103 incomplete Latin square design to determine the DE and ME of 1 basal diet and 9 experimental diets formulated with 9 unconventional plant protein meals.The DE andMEvalues of unconventional plant protein meals were calculated by the difference method.The in vitro digestible energy(IVDE)of 1 basal diet,9 experimental diets,and 9 unconventional plant protein meals were determined with 5 replicates of each sample in a complete randomized arrangement.The IVDE/DE or IVDE/ME ranged from 0.96 to 0.98 or 1.00 to 1.01,and the correlation coefficient between IVDE and DE or MEwas 0.97 or 0.98 in 10 experimental diets.Accordingly,the IVDE/DE or IVDE/ME ranged from 0.86 to 1.05 or 0.96 to 1.20,and the correlation coefficient between IVDE and DE orME was 0.92 or 0.91 in 9 unconventional plant protein meals.The coefficient of variation(CV)of IVDE was less than that of DE and ME in the experimental diets(0.43%,0.80%,and 0.97%for CV of IVDE,DE and ME,respectively)and unconventional plant protein meals(0.92%,4.84%,and 6.33%for CV of IVDE,DE and ME,respectively).The regression equations to predict DE from IVDE in 10 experimental diets and 9 unconventional plant protein meals were DE=0.8851IVDE t539(R^(2)=0.9411,residual standard deviation[RSD]=23 kcal/kg DM,P<0.01)and DE=0.9880IVDE t 166(R^(2)=0.8428,RSD=182 kcal/kg DM,P<0.01),respectively.Therewas no statistical difference in the slopes(P=0.82)or intercepts(P=1.00)of these 2 equations.Thus,10 diets and 9 unconventional plant protein meals were pooled to establish the regression equation of DE on IVDE as:DE=0.9813IVDE t187(R^(2)=0.9120,RSD=118 kcal/kg DM,P<0.01).The regression equations to predictME from IVDE in 10 experimental diets and 9 unconventional plant protein meals were ME=0.9559IVDE t146(R^(2)=0.9697,RSD=18 kcal/kg DM,P<0.01)and ME=0.9388IVDEt3(R^(2)=0.8282,RSD=182 kcal/kg DM,P<0.01),respectively.Therewas no statistical difference in slopes(P=0.97)but significant difference between the intercepts(P=0.02)of these 2 equations.Our results indicate IVDE has similar response to the DE but different response to the ME in 10 experimental diets and 9 unconventional plant protein meals.Therefore,IVDE is moresuitable to predict DE than ME of diets and unconventional plant protein meals for growing pigs. | Zhongyuan Du Yuming Wang Mingqiang Song Shuli Zeng Lixiang Gao Jiangtao Zhao Feng Zhao | 2022 | Animal Nutrition2022，，3： | 0 |
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