In agricultural irrigation engineering,deep leakage is a key factor that significantly reduces the utilization efficiency of irrigation water.Underground installation of porous membranes,as a novel active regulation t...In agricultural irrigation engineering,deep leakage is a key factor that significantly reduces the utilization efficiency of irrigation water.Underground installation of porous membranes,as a novel active regulation technology,can effectively reduce deep leakage losses of water in the soil through its physical barrier effect.However,the current understanding of the infiltration patterns of underground porous membranes remains inadequate,limiting the promotion and application of this technology.Therefore,this study integrates a methodology that combines numerical simulations with experimental validations.Using a non-membrane treatment as a control(CK),this study investigated the soil water infiltration of underground porous membranes under various combinations of saturated hydraulic conductivity(K_(s)),porous membrane diameter(D),burial depth(H),and spacing(S).The results indicated that under the four types of aeolian sandy soil conditions,underground installation of porous membranes had a significant impact on soil infiltration characteristics,exhibiting an infiltration-reducing effect.Upon entering the steady infiltration stage,the minimum reduction in the infiltration rate for the various porous membrane treatments was 2.86 times that of the CK treatment.At a specific irrigation time(t),the steady infiltration rate(i_(f))and cumulative infiltration(I)of soil increased with increasing K_(s),D,H,and S.There was a strong power function relationship between i_(f)and the four factors(R^(2)=0.997),with a coefficient of 0.209,and exponents of 1.14,1.04,0.48,and 0.30,respectively.Furthermore,based on the Kostiakov infiltration model and comprehensively considering K_(s),D,H,S,and t,an estimation model for cumulative infiltration of underground porous membranes was developed.The reliability of the estimation model was assessed using experimental data,with the root mean square error approaching 0 and the Nash-Sutcliffe efficiency coefficient close to 1,indicating the good predictive performance of the model.The findings of this study can provide a scientific basis for the operation and management of underground porous membrane irrigation projects.展开更多
Dy^3+-doped glass-ceramics containing NaCaPO4 crystals were successfully fabricated by heat treatment at base glass,and the luminescence properties were investigated for potential applications in radiation measurement...Dy^3+-doped glass-ceramics containing NaCaPO4 crystals were successfully fabricated by heat treatment at base glass,and the luminescence properties were investigated for potential applications in radiation measurements.The photo luminescence(PL)excitation and emission spectra exhibit transitions related to Dy^3+ions corresponding to the strongest excitation and emission wavelengths at 351 and 575 nm,respectively.The CW-OSL properties as a function of dopant concentration,pre-heating temperature,pre-heating time and signal fading were investigated.The most appropriate Dy^3+ion concentration was found to be 0.25 mol%.The TL glow curves have a broad peak feature peaking at 195±5℃.The fading of the OSL signal would keep stable in five days with the intensity value of about 76.11%.The samples also exhibit good signal reusability and a broad linear dose response range(0.02-1000 Gy).展开更多
45 P_(2)O_(5)-15 BaO-25 ZnO-15 B2O_(3)glasses doped with different concentrations(0 mol%,0.1 mol%,0.25 mol%,0.5 mol%,and 0.75 mol%)of Gd^(3+)were prepared by a melt-quenching method and treated to fabricate glass-cera...45 P_(2)O_(5)-15 BaO-25 ZnO-15 B2O_(3)glasses doped with different concentrations(0 mol%,0.1 mol%,0.25 mol%,0.5 mol%,and 0.75 mol%)of Gd^(3+)were prepared by a melt-quenching method and treated to fabricate glass-ceramics containing BaZn_(2)(PO_(4))_(2)crystals by controllable crystallization.The structural,optical,and dosimetric properties were investigated.FTIR spectra indicate that the glasses are composed of[PO_(4)],[BO_(3)],and[BO_(4)]basic structural units.The XRD pattern analysis indicates that the samples contain BaZn_(2)(PO_(4))_(2)crystals.In the photoluminesce nce(PL)spectra,two emission bands are observed at 307 and 313 nm due to the^(6)P_(5/2)→^(8)S_(7/2)and^(6)P_(7/2)→^(8)S_(7/2)transitions of Gd^(3+),respectively.The OSL dosimetric properties of glass-ceramics were studied further under beta radiation of90Sr.The optimal Gd^(3+)doping concentration of 0.5 mol%was determined.The fading of the OSL signal shows that the CW-OSL signal of Gd^(3+)-doped BaZn_(2)(PO_(4))_(2)glass-ceramics decays by about 58.95%within120 h,and the intensity remains stable thereafter.The thermoluminescence(TL)curve has three peaks at 164,240,and 344℃.Minimum detectable dose(MDD)of the 0.5 mol%Gd^(3+)-doped BaZn_(2)(PO_(4))_(2)glass-ceramics was calculated as 0.675 mGy.The samples also exhibit good signal reusability and a broad linear dose-response range(0.3-500 Gy).Results show the excellent dosimetric properties of Gd^(3+)-doped BaZn_(2)(PO_(4))_(2)glass-ceramics and their potential application in radiation dosimetry.展开更多
基金the National Natural Science Foundation of China(Grant No.51969027)Corps Financial Science and Technology Plan Projects of Xinjiang Province,China(Grant No.2021DB012,2023AB059)Ministry of Science and Technology of the People’s Republic of China-Third Comprehensive Scientific Expedition to Xinjiang(Grant No.2021xjkk0804).
文摘In agricultural irrigation engineering,deep leakage is a key factor that significantly reduces the utilization efficiency of irrigation water.Underground installation of porous membranes,as a novel active regulation technology,can effectively reduce deep leakage losses of water in the soil through its physical barrier effect.However,the current understanding of the infiltration patterns of underground porous membranes remains inadequate,limiting the promotion and application of this technology.Therefore,this study integrates a methodology that combines numerical simulations with experimental validations.Using a non-membrane treatment as a control(CK),this study investigated the soil water infiltration of underground porous membranes under various combinations of saturated hydraulic conductivity(K_(s)),porous membrane diameter(D),burial depth(H),and spacing(S).The results indicated that under the four types of aeolian sandy soil conditions,underground installation of porous membranes had a significant impact on soil infiltration characteristics,exhibiting an infiltration-reducing effect.Upon entering the steady infiltration stage,the minimum reduction in the infiltration rate for the various porous membrane treatments was 2.86 times that of the CK treatment.At a specific irrigation time(t),the steady infiltration rate(i_(f))and cumulative infiltration(I)of soil increased with increasing K_(s),D,H,and S.There was a strong power function relationship between i_(f)and the four factors(R^(2)=0.997),with a coefficient of 0.209,and exponents of 1.14,1.04,0.48,and 0.30,respectively.Furthermore,based on the Kostiakov infiltration model and comprehensively considering K_(s),D,H,S,and t,an estimation model for cumulative infiltration of underground porous membranes was developed.The reliability of the estimation model was assessed using experimental data,with the root mean square error approaching 0 and the Nash-Sutcliffe efficiency coefficient close to 1,indicating the good predictive performance of the model.The findings of this study can provide a scientific basis for the operation and management of underground porous membrane irrigation projects.
基金Project supported by the National Natural Science Foundation of China(11675260)。
文摘Dy^3+-doped glass-ceramics containing NaCaPO4 crystals were successfully fabricated by heat treatment at base glass,and the luminescence properties were investigated for potential applications in radiation measurements.The photo luminescence(PL)excitation and emission spectra exhibit transitions related to Dy^3+ions corresponding to the strongest excitation and emission wavelengths at 351 and 575 nm,respectively.The CW-OSL properties as a function of dopant concentration,pre-heating temperature,pre-heating time and signal fading were investigated.The most appropriate Dy^3+ion concentration was found to be 0.25 mol%.The TL glow curves have a broad peak feature peaking at 195±5℃.The fading of the OSL signal would keep stable in five days with the intensity value of about 76.11%.The samples also exhibit good signal reusability and a broad linear dose response range(0.02-1000 Gy).
基金Project supported by the National Natural Science Foundation of China(11675260)。
文摘45 P_(2)O_(5)-15 BaO-25 ZnO-15 B2O_(3)glasses doped with different concentrations(0 mol%,0.1 mol%,0.25 mol%,0.5 mol%,and 0.75 mol%)of Gd^(3+)were prepared by a melt-quenching method and treated to fabricate glass-ceramics containing BaZn_(2)(PO_(4))_(2)crystals by controllable crystallization.The structural,optical,and dosimetric properties were investigated.FTIR spectra indicate that the glasses are composed of[PO_(4)],[BO_(3)],and[BO_(4)]basic structural units.The XRD pattern analysis indicates that the samples contain BaZn_(2)(PO_(4))_(2)crystals.In the photoluminesce nce(PL)spectra,two emission bands are observed at 307 and 313 nm due to the^(6)P_(5/2)→^(8)S_(7/2)and^(6)P_(7/2)→^(8)S_(7/2)transitions of Gd^(3+),respectively.The OSL dosimetric properties of glass-ceramics were studied further under beta radiation of90Sr.The optimal Gd^(3+)doping concentration of 0.5 mol%was determined.The fading of the OSL signal shows that the CW-OSL signal of Gd^(3+)-doped BaZn_(2)(PO_(4))_(2)glass-ceramics decays by about 58.95%within120 h,and the intensity remains stable thereafter.The thermoluminescence(TL)curve has three peaks at 164,240,and 344℃.Minimum detectable dose(MDD)of the 0.5 mol%Gd^(3+)-doped BaZn_(2)(PO_(4))_(2)glass-ceramics was calculated as 0.675 mGy.The samples also exhibit good signal reusability and a broad linear dose-response range(0.3-500 Gy).Results show the excellent dosimetric properties of Gd^(3+)-doped BaZn_(2)(PO_(4))_(2)glass-ceramics and their potential application in radiation dosimetry.
