An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and te...An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and temperature com-pensation for modulation current in order to maintain constant extinction ratio and average optical power. To implement tem-perature compensation for modulation current,a novel circuit which generates a PTAT current by using the injecting base current of a bipolar transistor in saturation region,and alternates the amplifier feedback loop(closed or not) to control the state of the current path is presented. Simulation results showed that programmed by choice of external resistors,the IC can provide modu-lation current from 5 mA to 85 mA with temperature compensation adjustments and independent bias current from 4 mA to 100 mA. Optical test results showed that clear eye-diagrams can be obtained at 155 Mbps,with the output optical power being nearly constant,and the variation of extinction ratio being lower than 0.7 dB.展开更多
Electric vehicles(EVs)have garnered significant attention as a vital driver of economic growth and environmental sustainability.Nevertheless,ensuring the safety of high-energy batteries is now a top priority that cann...Electric vehicles(EVs)have garnered significant attention as a vital driver of economic growth and environmental sustainability.Nevertheless,ensuring the safety of high-energy batteries is now a top priority that cannot be overlooked during large-scale applications.This paper proposes an innovative active protection and cooling integrated battery module using smart materials,magneto-sensitive shear thickening fluid(MSTF),which is specifically designed to address safety threats posed by lithium-ion batteries(LIBs)exposed to harsh mechanical and environmental conditions.The theoretical framework introduces a novel approach for harnessing the smoothed-particle hydrodynamics(SPH)methodology that incorporates the intricate interplay of non-Newtonian fluid behavior,capturing the fluid-structure coupling inherent to the MSTF.This approach is further advanced by adopting an enhanced Herschel-Bulkley(H-B)model to encapsulate the intricate rheology of the MSTF under the influence of the magnetorheological effect(MRE)and shear thickening(ST)behavior.Numerical simulation results show that in the case of cooling,the MSTF is an effective cooling medium for rapidly reducing the temperature.In terms of mechanical abuse,the MSTF solidifies through actively applying the magnetic field during mechanical compression and impact within the battery module,resulting in 66%and 61.7%reductions in the maximum stress within the battery jellyroll,and 31.1%and 23%reductions in the reaction force,respectively.This mechanism effectively lowers the risk of short-circuit failure.The groundbreaking concepts unveiled in this paper for active protection battery modules are anticipated to be a valuable technological breakthrough in the areas of EV safety and lightweight/integrated design.展开更多
The 30 kW high-power electric servo system used in the solid booster of the Long March 6 A(LM-6 A)launch vehicle is introduced,and the function,composition of the system as well as its constituent equipments are detai...The 30 kW high-power electric servo system used in the solid booster of the Long March 6 A(LM-6 A)launch vehicle is introduced,and the function,composition of the system as well as its constituent equipments are detailed.To solve the problem of out-of-tolerance in the system dynamic characteristics,an advanced correction network algorithm architecture and double notch filter were designed.Experimental verification was conducted to prove that the dynamic characteristics requirement under multiple operating conditions could be met.展开更多
Thermo-sensitive genic male-sterile(TGMS)lines are fertile at lower temperatures but male sterile above a critical sterility-inducing temperature(CSIT),which varies substantially across TGMS lines.Such lines are valua...Thermo-sensitive genic male-sterile(TGMS)lines are fertile at lower temperatures but male sterile above a critical sterility-inducing temperature(CSIT),which varies substantially across TGMS lines.Such lines are valuable resources for breeding two-line hybrid rice(Oryza sativa).However,as their utility is restricted by the CSIT,understanding its regulatory mechanisms has crucial breeding-associated implications.The thermo-sensitive genic male sterility 5(tms5)mutation is common to most TGMS lines.We previously revealed that tms5 mutants failed to recycle cyclic phosphate(cP)-containingΔCCA-tRNAs,particularly in pollen mother cells,resulting in fewer mature tRNAs,thereby causing TGMS.However,the CSIT-regulatory network in the tms5 lines remains unelucidated.Here,we characterized the CSITrelated ribosome-associated quality control 1(OsRqc1)gene.OsRqc1 binds to the 60S ribosomal subunits and functions in ribosomeassociated quality control.It also regulates the CSIT in tms5 lines by assisting OsVms1 in recruiting these subunits to generate cP-ΔCCAtRNAs.Variations in a 6-bp repeat in the 5′untranslated region of OsRqc1 in rice subspecies affect its transcription,thereby altering the CSIT in tms5 lines.These findings reveal the role of an OsRqc1-OsVms1 module in regulating CSIT,providing valuable insights into genetic variations in OsRqc1.Such results may facilitate the molecular breeding of rice two-line hybrid tms5 lines with specific CSITs,which can adapt to regions with different environments.展开更多
基金Project (No. 2006AA01Z226) supported by the Hi-Tech Researchand Development Program (863) of China
文摘An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and temperature com-pensation for modulation current in order to maintain constant extinction ratio and average optical power. To implement tem-perature compensation for modulation current,a novel circuit which generates a PTAT current by using the injecting base current of a bipolar transistor in saturation region,and alternates the amplifier feedback loop(closed or not) to control the state of the current path is presented. Simulation results showed that programmed by choice of external resistors,the IC can provide modu-lation current from 5 mA to 85 mA with temperature compensation adjustments and independent bias current from 4 mA to 100 mA. Optical test results showed that clear eye-diagrams can be obtained at 155 Mbps,with the output optical power being nearly constant,and the variation of extinction ratio being lower than 0.7 dB.
基金Project supported by the National Natural Science Foundation of China(Nos.12072183 and11872236)the Key Research Project of Zhejiang Laboratory(No.2021PE0AC02)。
文摘Electric vehicles(EVs)have garnered significant attention as a vital driver of economic growth and environmental sustainability.Nevertheless,ensuring the safety of high-energy batteries is now a top priority that cannot be overlooked during large-scale applications.This paper proposes an innovative active protection and cooling integrated battery module using smart materials,magneto-sensitive shear thickening fluid(MSTF),which is specifically designed to address safety threats posed by lithium-ion batteries(LIBs)exposed to harsh mechanical and environmental conditions.The theoretical framework introduces a novel approach for harnessing the smoothed-particle hydrodynamics(SPH)methodology that incorporates the intricate interplay of non-Newtonian fluid behavior,capturing the fluid-structure coupling inherent to the MSTF.This approach is further advanced by adopting an enhanced Herschel-Bulkley(H-B)model to encapsulate the intricate rheology of the MSTF under the influence of the magnetorheological effect(MRE)and shear thickening(ST)behavior.Numerical simulation results show that in the case of cooling,the MSTF is an effective cooling medium for rapidly reducing the temperature.In terms of mechanical abuse,the MSTF solidifies through actively applying the magnetic field during mechanical compression and impact within the battery module,resulting in 66%and 61.7%reductions in the maximum stress within the battery jellyroll,and 31.1%and 23%reductions in the reaction force,respectively.This mechanism effectively lowers the risk of short-circuit failure.The groundbreaking concepts unveiled in this paper for active protection battery modules are anticipated to be a valuable technological breakthrough in the areas of EV safety and lightweight/integrated design.
文摘The 30 kW high-power electric servo system used in the solid booster of the Long March 6 A(LM-6 A)launch vehicle is introduced,and the function,composition of the system as well as its constituent equipments are detailed.To solve the problem of out-of-tolerance in the system dynamic characteristics,an advanced correction network algorithm architecture and double notch filter were designed.Experimental verification was conducted to prove that the dynamic characteristics requirement under multiple operating conditions could be met.
基金supported by the Biological Breeding-National Science and Technology Major Project of China(2023ZD04073)the Biological Breeding-Major Projects(2023ZD04076)+1 种基金the National Key Research and Development Program of China(2020YFA0509900)the National Natural Science Foundation of China(32330019,32471307,32171284,32370633,32170620).
文摘Thermo-sensitive genic male-sterile(TGMS)lines are fertile at lower temperatures but male sterile above a critical sterility-inducing temperature(CSIT),which varies substantially across TGMS lines.Such lines are valuable resources for breeding two-line hybrid rice(Oryza sativa).However,as their utility is restricted by the CSIT,understanding its regulatory mechanisms has crucial breeding-associated implications.The thermo-sensitive genic male sterility 5(tms5)mutation is common to most TGMS lines.We previously revealed that tms5 mutants failed to recycle cyclic phosphate(cP)-containingΔCCA-tRNAs,particularly in pollen mother cells,resulting in fewer mature tRNAs,thereby causing TGMS.However,the CSIT-regulatory network in the tms5 lines remains unelucidated.Here,we characterized the CSITrelated ribosome-associated quality control 1(OsRqc1)gene.OsRqc1 binds to the 60S ribosomal subunits and functions in ribosomeassociated quality control.It also regulates the CSIT in tms5 lines by assisting OsVms1 in recruiting these subunits to generate cP-ΔCCAtRNAs.Variations in a 6-bp repeat in the 5′untranslated region of OsRqc1 in rice subspecies affect its transcription,thereby altering the CSIT in tms5 lines.These findings reveal the role of an OsRqc1-OsVms1 module in regulating CSIT,providing valuable insights into genetic variations in OsRqc1.Such results may facilitate the molecular breeding of rice two-line hybrid tms5 lines with specific CSITs,which can adapt to regions with different environments.
