Optical temperature sensor materials face great challenges in terms of temperature measurement sensitivity and applicability in extreme environments.To overcome these problems,Er^(3+)∕Yb^(3+)co-doped La_(2)O_(3)-TiO_...Optical temperature sensor materials face great challenges in terms of temperature measurement sensitivity and applicability in extreme environments.To overcome these problems,Er^(3+)∕Yb^(3+)co-doped La_(2)O_(3)-TiO_(2)-Ga_(2)O_(3)-ZrO_(2)(LTGZ)glasses were designed and synthesized using the aerodynamic levitation method.In the glass system,the strongest intensity of upconversion luminescence was measured on 3.0Yb^(3+)∕0.5Er^(3+)(mole fraction)co-doped LTGZ glasses.In the temperature range of 300 to 700 K,the maximum relative and absolute sensitivities were 2.71%and 0.56%K^(−1),respectively.The temperature reliability was proved through variable temperature cycling tests.More importantly,to our knowledge,it is the first time to investigate the optical temperature measurement capability under a high magnetic field in this as-designed sensor.By applying the magnetic field up to 42 T,the relative sensitivity changes from 1.79%to 1.58%K^(−1),revealing that the temperature sensitivity of the sensor remains stable even in high magnetic fields.The results of the study provide a reference for the selection of temperature measurement materials in the field of optical temperature sensing,and the designed temperature sensor can be used for temperature measurement in extreme environments,especially in strong magnetic field conditions,which provides an important value for the development of special optical temperature sensors.展开更多
Backfill mining technology is the practice of returning waste materials underground for both disposal and geotechnical stability,however,a challenge with current technologies is that they commonly require cement-based...Backfill mining technology is the practice of returning waste materials underground for both disposal and geotechnical stability,however,a challenge with current technologies is that they commonly require cement-based binders which have a relatively high environmental impact.Finding alternatives to cement-based binders can improve environmental performance and this paper proposes microbial grouted backfill(MGB)as a potential solution.In this paper,the effects of the cementation solution concentration(CSC),volume ratio of bacterial solution to cementation solution(VRBC),particle sizes of the aggregates,and the number of grouting batches on the mechanical properties of MGB are studied.The experimental results show that MGB strength increased,up to a peak value,as CSC was increased,before decreasing as CSC was increased further.The results also show that MGB strength increased,up to a peak value,as VRBC decreased,before decreasing as the VRBC was decreased further.The peak strength was achieved at a CSC of 2 mol/L and a VRBC of 1:9.The strength of the MGB also increased as the number of grouting batches increased.Graded MGB samples showed the highest UCS,25.12 MPa,at particle sizes of 0.2 to 0.8 mm,while full(non-graded)MGB samples displayed mean UCS values ranging from1.56 MPa when the maximum particle size was 0.2 mm,up to 13 MPa when the maximum particle size was 1.2 mm.MGB samples are consolidated by the calcium carbonate that is precipitated during microbial metabolism,and the strength of MGB increases linearly as calcium carbonate content increases.The calcium carbonate minerals produced in MGB materials are primarily calcite,with secondary amounts of vaterite.展开更多
基金supported by the Ministry of Human Resources and Social Security of the People’s Republic of China(Grant No.S20240022)the Hubei Provincial Natural Science Foundation for Innovation and Development(Grant No.2025AFD325)the Interdisciplinary Program of Wuhan National High Magnetic Field Center(Grant No.WHMFC202129).
文摘Optical temperature sensor materials face great challenges in terms of temperature measurement sensitivity and applicability in extreme environments.To overcome these problems,Er^(3+)∕Yb^(3+)co-doped La_(2)O_(3)-TiO_(2)-Ga_(2)O_(3)-ZrO_(2)(LTGZ)glasses were designed and synthesized using the aerodynamic levitation method.In the glass system,the strongest intensity of upconversion luminescence was measured on 3.0Yb^(3+)∕0.5Er^(3+)(mole fraction)co-doped LTGZ glasses.In the temperature range of 300 to 700 K,the maximum relative and absolute sensitivities were 2.71%and 0.56%K^(−1),respectively.The temperature reliability was proved through variable temperature cycling tests.More importantly,to our knowledge,it is the first time to investigate the optical temperature measurement capability under a high magnetic field in this as-designed sensor.By applying the magnetic field up to 42 T,the relative sensitivity changes from 1.79%to 1.58%K^(−1),revealing that the temperature sensitivity of the sensor remains stable even in high magnetic fields.The results of the study provide a reference for the selection of temperature measurement materials in the field of optical temperature sensing,and the designed temperature sensor can be used for temperature measurement in extreme environments,especially in strong magnetic field conditions,which provides an important value for the development of special optical temperature sensors.
基金supported by the National Natural Science Foundation of China(Nos.5180430852034009)+3 种基金the China Postdoctoral Science Foundation(Nos.2020T1302692020M670689)the Yue Qi Young Scholar Project(No.2020QN03)the Postdoctoral Research Project of Hebei Province(No.B2020003029)。
文摘Backfill mining technology is the practice of returning waste materials underground for both disposal and geotechnical stability,however,a challenge with current technologies is that they commonly require cement-based binders which have a relatively high environmental impact.Finding alternatives to cement-based binders can improve environmental performance and this paper proposes microbial grouted backfill(MGB)as a potential solution.In this paper,the effects of the cementation solution concentration(CSC),volume ratio of bacterial solution to cementation solution(VRBC),particle sizes of the aggregates,and the number of grouting batches on the mechanical properties of MGB are studied.The experimental results show that MGB strength increased,up to a peak value,as CSC was increased,before decreasing as CSC was increased further.The results also show that MGB strength increased,up to a peak value,as VRBC decreased,before decreasing as the VRBC was decreased further.The peak strength was achieved at a CSC of 2 mol/L and a VRBC of 1:9.The strength of the MGB also increased as the number of grouting batches increased.Graded MGB samples showed the highest UCS,25.12 MPa,at particle sizes of 0.2 to 0.8 mm,while full(non-graded)MGB samples displayed mean UCS values ranging from1.56 MPa when the maximum particle size was 0.2 mm,up to 13 MPa when the maximum particle size was 1.2 mm.MGB samples are consolidated by the calcium carbonate that is precipitated during microbial metabolism,and the strength of MGB increases linearly as calcium carbonate content increases.The calcium carbonate minerals produced in MGB materials are primarily calcite,with secondary amounts of vaterite.
