A method is proposed for high-resolution neutron spectrum regulation across the entire energy domain.It was applied to in-reactor transuranic isotope production.This method comprises four modules:a neutron spectrum pe...A method is proposed for high-resolution neutron spectrum regulation across the entire energy domain.It was applied to in-reactor transuranic isotope production.This method comprises four modules:a neutron spectrum perturbation module,a neutron spectrum calculation module,a neutron spectrum valuation module,and an intelligent optimization module.It makes it possible to determine the optimal neutron spectrum for transuranic isotope production and a regulation scheme to establish this neutron spectrum within the reactor.The state-of-the-art production schemes for^(252)Cf and^(238)Pu in the High Flux Isotope Reactor were optimized,improving the yield of^(252)Cf by 12.16%and that of^(238)Pu by 7.53-25.84%.Moreover,the proposed optimization schemes only disperse certain nuclides into the targets without modifying the reactor design parameters,making them simple and feasible.The new method achieves efficient and precise neutron spectrum optimization,maximizing the production of transuranic isotopes.展开更多
Microbiologically driven acidic pollution of coal gangue has become amajor environmental problem in coal gangue dumps in coal mining areas.Addition of bactericides and sulphate reducing bacteria(SRB)is an effective me...Microbiologically driven acidic pollution of coal gangue has become amajor environmental problem in coal gangue dumps in coal mining areas.Addition of bactericides and sulphate reducing bacteria(SRB)is an effective means to control the acidic pollution of coal gangue,but their mechanism of action has not been fully investigated.By adding bactericide,SRB and bactericide-SRB to the newly produced coal gangue,respectively,the effects of these treatments on the microbial community structure were observed.Changes in pH and electrical conductivity(EC)of the gangue leaching solution,as well as themicrobial community composition and functional abundance on the gangue surface were analysed by leaching simulation experiments and 16S rRNA sequencing.The results showed that(1)the addition of bactericide-SRB was the most effective treatment to elevate pH before 8 d,while the addition of SRB performed best after 22 d(2)The addition of bactericide and SRB drastically changed the microbial community structure on the gangue surface.Simultaneous addition of both had the best inhibitory effect on pathogenic bacteria and Thiobacillus.(3)All three treatments promote higher abundance of genes related to nitrogen cycling,but reflected in different gene functions.Microorganisms with sulfate respiration function in the experimental group all showed different increases.The abundance of other sulfur cycle genes decreased substantially.However,Human Pathogens All had higher abundance than control check(CK)in each treatment,whichmay indicate that the addition of either bactericides or SRB increases the risk of microbial pathogenicity to humans.展开更多
We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux reactors.The filter burnup and singl...We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux reactors.The filter burnup and single energy burnup methods have no theoretical approximation and can achieve a spectrum resolution of up to~1 eV,thereby constructing the importance curve and yield curve of the full energy range.The burnup extreme analysis method combines the importance and yield curves to consider the influence of irradiation time on production efficiency,thereby constructing extreme curves.The three curves,which quantify the transmutation rate of the nuclei in each energy region,are of physical significance because they have similar distributions.A high-resolution neutronics model for ^(238)Pu production was established based on these three curves,and its universality and feasibility were proven.The neutronics model can guide the neutron spectrum optimization and improve the yield of ^(238)Pu by up to 18.81%.The neutronics model revealed the law of nuclei transmutation in all energy regions with high spectrum resolution,thus providing theoretical support for high-flux reactor design and irradiation production of ^(238)Pu.展开更多
[目的]介绍双束双隧道弹性固定下胫腓联合损伤的手术技术和初步临床结果。[方法]2017年6月~2019年6月,对13例下胫腓联合完全损伤的患者采用Endobutton钢板进行双束双隧道立体仿生弹性固定。先将下胫腓联合解剖复位,然后在踝关节休息位...[目的]介绍双束双隧道弹性固定下胫腓联合损伤的手术技术和初步临床结果。[方法]2017年6月~2019年6月,对13例下胫腓联合完全损伤的患者采用Endobutton钢板进行双束双隧道立体仿生弹性固定。先将下胫腓联合解剖复位,然后在踝关节休息位采用定位导向器自腓骨外侧偏后、胫距关节近端3.0 cm处分别朝前内上方和后内方建立两条骨隧道,再将组装好的3枚Endobutton钢板系统分别穿过2个骨隧道,拉紧后打结固定。[结果]13例手术均顺利完成,术后所有患者均获得随访(14.37±5.63)个月,末次随访时健患侧踝关节活动度(range of motion,ROM)差异无统计学意义(P>0.05),AOFAS评分平均(88.76±3.15)分,Mazur评分优良率为92.31%。[结论]双束双隧道弹性固定下胫腓损伤,疗效满意,该固定装置无需在完全负重前取出。展开更多
We sought to assess the psychological status and diabetes-related distress of Chinese type 1 diabetes patients in Jiangsu province, China. According to the World Health Organization criteria, 42 patients with type 1 d...We sought to assess the psychological status and diabetes-related distress of Chinese type 1 diabetes patients in Jiangsu province, China. According to the World Health Organization criteria, 42 patients with type 1 diabetes were enrolled in the study and assessed with the Self-Rating Anxiety Scale （SAS）, Self-Rating Depression Scale （SDS） and Diabetes Distress Scale （DDS）. All data were tabulated and statistical analyses were performed. The study summarized cases of 42 patients with type 1 diabetes, including 17 males and 25 females with a mean age of 23- 12 years and a mean duration of diabetes of 7_ 6 years. Compared to the Chinese normative data, the SAS standard score was significantly higher, whereas SDS standard score had no statistical significance. The SAS standard score was most highly correlated with diabetes duration （y = 0.547, P = 0.011）. Additionally, 19.5% of the patients had moderate or even severe diabetes-related distress and 21.4% had moderate or even severe emo- tional burden while 26.2% had regimen-related distress. Multiple stepwise regression analysis showed that the mean correlation between DDS and the four domains was high, particularly the emotional burden domain （esti- mated D = 0.363, P 〈 0.001） and regimen-related distress domain （estimated 13 = 0.356, P 〈 0.001）. The correlation between SAS and DDS was positive （estimated 13 = 0.039, P = 0.027）. In conclusion, the results showed the im- portance of psychological aspects in Chinese individuals with type 1 diabetes. Screening and treatment of psycho- logical aspects may result in better adherence and increased quality of life for patients with diabetes.展开更多
A novel ammonia synthesis catalyst, potassium-promoted ruthenium supported on carbon nanotubes, was developed. It was found that the Ru-K/carbon nanotubes catalyst had higher activity for ammonia synthesis (20.85 ml N...A novel ammonia synthesis catalyst, potassium-promoted ruthenium supported on carbon nanotubes, was developed. It was found that the Ru-K/carbon nanotubes catalyst had higher activity for ammonia synthesis (20.85 ml NH3/h/g-cat) than the Ru-K/fullerenes ( 13.3 ml NH3/h/g-cat) at atmospheric pressure and 623 K. The catalyst had activity even at 473 K, and had the highest activity( 23.46 ml NH3/h/g-cat) at 643 K. It was suggested that the multi-walled structure favored the electron transfer, the hydrogen-storage and the hydrogen-spill which were favorable to ammonia synthesis.展开更多
Transplutonium isotopes are scarce and need to be produced by irradiation in high flux reactors.However,their production is inefficient,and optimization studies are necessary.This study analyzes the physical nature of...Transplutonium isotopes are scarce and need to be produced by irradiation in high flux reactors.However,their production is inefficient,and optimization studies are necessary.This study analyzes the physical nature of transplutonium isotope produc-tion using ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu as examples.Traditional methods based on the Monte Carlo burnup calculation have the limitations of many calculations and cannot analyze the individual energy intervals in detail;thus,they cannot sup-port the refined evaluation,screening,and optimization of the irradiation schemes.After understanding the physical nature and simplifying the complexity of the production process,we propose a rapid diagnostic method for evaluating radiation schemes based on the concepts“single energy interval value(SEIV)”and“energy spectrum total value(ESTV)”.The rapid diagnostic method not only avoids tedious burnup calculations,but also provides a direction for optimization.The optimal irradiation schemes for producing ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu are determined based on a rapid diagnostic method.Optimal irradiation schemes can significantly improve production efficiency.Compared with the initial scheme,the optimal scheme improved the production efficiency of ^(238)Pu by 7.41 times;^(242)Cm,11.98 times;^(244)Cm,65.20 times;and ^(252)Cf,15.08 times.Thus,a refined analysis of transplutonium isotope production is conducted and provides a theoretical basis for improving production efficiency.展开更多
AZ91 magnesium alloy was subjected to a deep cryogenic treatment. X-ray diffraction （XRD）, scanning electronic microscopy （SEM）, and transmission electronic microscopy （TEM） methods were utilized to characterize...AZ91 magnesium alloy was subjected to a deep cryogenic treatment. X-ray diffraction （XRD）, scanning electronic microscopy （SEM）, and transmission electronic microscopy （TEM） methods were utilized to characterize the composition and microstructure of the treated samples. The results show that after two cryogenic treatments, the quantity of the precipitate hardening β phase increases, and the sizes of the precipitates are refined from 8-10μm to 2-4μm. This is expected to be due to the decreased solubility of aluminum in the matrix at low temperature and the significant plastic deformation owing to internal differences in thermal contraction between phases and grains. The polycrystalline matrix is also noticeably refined, with the sizes of the subsequent nanocrystalline grains in the range of 50-100 nm. High density dislocations are observed to pile up at the grain boundaries, inducing the dynamic recrystallization of the microstructure, leading to the generation of a nanocrystalline grain structure. After two deep cryogenic treatments, the tensile strength and elongation are found to be substantially increased, rising from 243 MPa and 4.4% of as-cast state to 299 MPa and 5.1%.展开更多
This paper discussed the optimization of conditions for remediation of crude oil-polluted soil based on pot experiment by applying reed-specific degrading bacteria, and using response surfaces methodology. We took the...This paper discussed the optimization of conditions for remediation of crude oil-polluted soil based on pot experiment by applying reed-specific degrading bacteria, and using response surfaces methodology. We took the initial crude oil concentration, the amount of inoculation, the ratio of nitrogen and phosphorus, and the use of surfactant （Tween-80） as independent variables （factors）, and the degrading ratio of crude oil as the dependent variable （response） after a 90-day experiment. The experiment explored the impacts of each independent variable and their interactions on the bioremediation of crude oil-polluted soil using the Box-Behnken design. Working with a simulated forecasting model the study obtained optimization va reed＋specific degrading bacteria, a nitrogen to phosphorus ues for the treatment parameters of 200 g/kg of the ratio of about 6.0. and 0.2% surfactant. Under experimental conditions, for crude oil concentrations of 10, 30 and 50 g/kg, the optimal effects of the treatments achieved 71.87%, 66.61% and 54.52% degradation of the crude oil, respectively. The results can provide a basis for the technical development of plant-microorganism combined bioremediation of crude oil-polluted soil.展开更多
In this paper,we propose a theoretical model of the surface plasmon resonance-based optical fiber biosensor for detecting glucose concentration.The Au/ZnO/WS2 multilayer film is coated around optical fiber.Compared wi...In this paper,we propose a theoretical model of the surface plasmon resonance-based optical fiber biosensor for detecting glucose concentration.The Au/ZnO/WS2 multilayer film is coated around optical fiber.Compared with the conventional surface plasmon resonance sensor,WS2 material can increase the sensitivity of the biosensor.The absorption capacity of WS2 is used to load glucose oxidase by forming a sensitive area to recognize glucose.Refractive index of the solution is calculated and then the concentration of the glucose can be obtained by the correspondence between refractive index and glucose concentration.The highest sensitivity of the SPR biosensor with a structure of 40-nm Au/5-nm ZnO/14 layers of WS2 is 4310 nm/RIU.The proposed WS2-based SPR fiber biosensor has a unique effect on the detection of glucose concentration.It is expected to have potential applications in future medical blood glucose concentration detection.展开更多
目的评价外踝远端钩钢板治疗外踝远端骨折的疗效。方法回顾性分析我院自2013年1月至2017年1月收治的单纯外踝远端骨折27例,男性16例,女性11例;年龄25～55岁,平均年龄(38±9)岁。27例均采用外踝远端钩钢板治疗。术后定期随访,采用踝...目的评价外踝远端钩钢板治疗外踝远端骨折的疗效。方法回顾性分析我院自2013年1月至2017年1月收治的单纯外踝远端骨折27例,男性16例,女性11例;年龄25～55岁,平均年龄(38±9)岁。27例均采用外踝远端钩钢板治疗。术后定期随访,采用踝关节活动度(range of motion,ROM)和评分系统评价踝关节功能康复情况。结果 27例中25例获得随访,术后随访19～47个月,平均(31±9)个月。末次随访时,患侧踝关节活动度ROM(包括屈伸、内翻、外翻)较健侧比较,差异均无统计学意义(P>0.05)。Mazur评分平均(88.64±3.41)分,优17例,良6例,可1例,差1例,优良率92.00%。结论外踝远端钩钢板治疗外踝远端骨折可达到解剖复位,固定牢靠,满足早期功能锻练,有利于踝关节功能康复,操作简便,对软组织刺激小。展开更多
Novel silicon nanotubes with inner-diameter of 60-80 nm was prepared using; hydrogen-added dechlorination of SiCl4 followed by chemical vapor deposition (CVD) on a NixMgyO catalyst. The TEM observation showed that the...Novel silicon nanotubes with inner-diameter of 60-80 nm was prepared using; hydrogen-added dechlorination of SiCl4 followed by chemical vapor deposition (CVD) on a NixMgyO catalyst. The TEM observation showed that the suitable reaction temperature is 973 K for the formation of silicon nanotubes. Most of silicon nanotubes have one open end and some have two closed ends. The shape of nanoscale silicon, however, isa micro-crystal type at 873 K, a rod or needle type at 993 K and an onion-type at 1023 K, respectively.展开更多
On January 1,2021,the newly revised Archives Law of the People's Republic of China(hereinafter referred to as the new Archives Law)was officially implemented,providing legal protection for archive management,archi...On January 1,2021,the newly revised Archives Law of the People's Republic of China(hereinafter referred to as the new Archives Law)was officially implemented,providing legal protection for archive management,archive work and archive undertaking in the new era.Starting from the relevant provisions of the new Archives Law,the collection of precious meteorological archives was discussed,and it is believed that only on the basis of clarifying the definition,collection responsibility subject,collection scope,ways and methods of precious meteorological archives can the relevant units be convenient to practice and obtain substantive collection effect.展开更多
Background Accurate motion tracking in head-mounted displays(HMDs)has been widely used in immersive VR interaction technologies.However,tracking the head motion of users at all times is not always desirable.During a s...Background Accurate motion tracking in head-mounted displays(HMDs)has been widely used in immersive VR interaction technologies.However,tracking the head motion of users at all times is not always desirable.During a session of HMD usage,users may make scene-irrelevant head rotations,such as adjusting the head position to avoid neck pain or responding to distractions from the physical world.To the best of our knowledge,this is the first study that addresses the problem of scene-irrelevant head movements.Methods We trained a classifier to detect scene-irrelevant motions using temporal eye head-coordinated information sequences.To investigate the usefulness of the detection results,we propose a technique to suspend motion tracking in HMDs where scene-irrelevant motions are detected.Results/Conclusions Experimental results demonstrate that the scene-relevancy of movements can be detected using eye-head coordination information,and that ignoring scene-irrelevant head motions in HMDs improves user continuity without increasing sickness or breaking immersion.展开更多
Metachromatic leukodystrophy(MLD)is an inherited disease caused by a deficiency of the enzyme arylsulfatase A(ARSA).Lentivirus-modified autologous hematopoietic stem cell gene therapy(HSCGT)has recently been approved ...Metachromatic leukodystrophy(MLD)is an inherited disease caused by a deficiency of the enzyme arylsulfatase A(ARSA).Lentivirus-modified autologous hematopoietic stem cell gene therapy(HSCGT)has recently been approved for clinical use in pre and early symptomatic children with MLD to increase ARSA activity.Unfortunately,this advanced therapy is not available for most patients with MLD who have progressed to more advanced symptomatic stages at diagnosis.Patients with late-onset juvenile MLD typically present with a slower neurological progression of symptoms and represent a significant burden to the economy and healthcare system,whereas those with early onset infantile MLD die within a few years of symptom onset.We conducted a pilot study to determine the safety and benefit of HSCGT in patients with postsymptomatic juvenile MLD and report preliminary results.The safety profile of HSCGT was favorable in this long-term follow-up over 9 years.The most common adverse events(AEs)within 2 months of HSCGT were related to busulfan conditioning,and all AEs resolved.No HSCGT-related AEs and no evidence of distorted hematopoietic differentiation during long-term follow-up for up to 9.6 years.Importantly,to date,patients have maintained remarkably improved ARSA activity with a stable disease state,including increased Functional Independence Measure(FIM)score and decreased magnetic resonance imaging(MRI)lesion score.This long-term follow-up pilot study suggests that HSCGT is safe and provides clinical benefit to patients with postsymptomatic juvenile MLD.展开更多
基金sponsored by the National Natural Science Foundation of China(No.12305190)the Lingchuang Research Project of the China National Nuclear Corporation(CNNC)。
文摘A method is proposed for high-resolution neutron spectrum regulation across the entire energy domain.It was applied to in-reactor transuranic isotope production.This method comprises four modules:a neutron spectrum perturbation module,a neutron spectrum calculation module,a neutron spectrum valuation module,and an intelligent optimization module.It makes it possible to determine the optimal neutron spectrum for transuranic isotope production and a regulation scheme to establish this neutron spectrum within the reactor.The state-of-the-art production schemes for^(252)Cf and^(238)Pu in the High Flux Isotope Reactor were optimized,improving the yield of^(252)Cf by 12.16%and that of^(238)Pu by 7.53-25.84%.Moreover,the proposed optimization schemes only disperse certain nuclides into the targets without modifying the reactor design parameters,making them simple and feasible.The new method achieves efficient and precise neutron spectrum optimization,maximizing the production of transuranic isotopes.
文摘Microbiologically driven acidic pollution of coal gangue has become amajor environmental problem in coal gangue dumps in coal mining areas.Addition of bactericides and sulphate reducing bacteria(SRB)is an effective means to control the acidic pollution of coal gangue,but their mechanism of action has not been fully investigated.By adding bactericide,SRB and bactericide-SRB to the newly produced coal gangue,respectively,the effects of these treatments on the microbial community structure were observed.Changes in pH and electrical conductivity(EC)of the gangue leaching solution,as well as themicrobial community composition and functional abundance on the gangue surface were analysed by leaching simulation experiments and 16S rRNA sequencing.The results showed that(1)the addition of bactericide-SRB was the most effective treatment to elevate pH before 8 d,while the addition of SRB performed best after 22 d(2)The addition of bactericide and SRB drastically changed the microbial community structure on the gangue surface.Simultaneous addition of both had the best inhibitory effect on pathogenic bacteria and Thiobacillus.(3)All three treatments promote higher abundance of genes related to nitrogen cycling,but reflected in different gene functions.Microorganisms with sulfate respiration function in the experimental group all showed different increases.The abundance of other sulfur cycle genes decreased substantially.However,Human Pathogens All had higher abundance than control check(CK)in each treatment,whichmay indicate that the addition of either bactericides or SRB increases the risk of microbial pathogenicity to humans.
基金supported by Natural Science Foundation of China (No. 12305190)Lingchuang Research Project of China National Nuclear Corporation (CNNC)the Science and Technology on Reactor System Design Technology Laboratory
文摘We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux reactors.The filter burnup and single energy burnup methods have no theoretical approximation and can achieve a spectrum resolution of up to~1 eV,thereby constructing the importance curve and yield curve of the full energy range.The burnup extreme analysis method combines the importance and yield curves to consider the influence of irradiation time on production efficiency,thereby constructing extreme curves.The three curves,which quantify the transmutation rate of the nuclei in each energy region,are of physical significance because they have similar distributions.A high-resolution neutronics model for ^(238)Pu production was established based on these three curves,and its universality and feasibility were proven.The neutronics model can guide the neutron spectrum optimization and improve the yield of ^(238)Pu by up to 18.81%.The neutronics model revealed the law of nuclei transmutation in all energy regions with high spectrum resolution,thus providing theoretical support for high-flux reactor design and irradiation production of ^(238)Pu.
文摘[目的]介绍双束双隧道弹性固定下胫腓联合损伤的手术技术和初步临床结果。[方法]2017年6月~2019年6月,对13例下胫腓联合完全损伤的患者采用Endobutton钢板进行双束双隧道立体仿生弹性固定。先将下胫腓联合解剖复位,然后在踝关节休息位采用定位导向器自腓骨外侧偏后、胫距关节近端3.0 cm处分别朝前内上方和后内方建立两条骨隧道,再将组装好的3枚Endobutton钢板系统分别穿过2个骨隧道,拉紧后打结固定。[结果]13例手术均顺利完成,术后所有患者均获得随访(14.37±5.63)个月,末次随访时健患侧踝关节活动度(range of motion,ROM)差异无统计学意义(P>0.05),AOFAS评分平均(88.76±3.15)分,Mazur评分优良率为92.31%。[结论]双束双隧道弹性固定下胫腓损伤,疗效满意,该固定装置无需在完全负重前取出。
基金supported by Natural Science Foundation of China(No.81070622)
文摘We sought to assess the psychological status and diabetes-related distress of Chinese type 1 diabetes patients in Jiangsu province, China. According to the World Health Organization criteria, 42 patients with type 1 diabetes were enrolled in the study and assessed with the Self-Rating Anxiety Scale （SAS）, Self-Rating Depression Scale （SDS） and Diabetes Distress Scale （DDS）. All data were tabulated and statistical analyses were performed. The study summarized cases of 42 patients with type 1 diabetes, including 17 males and 25 females with a mean age of 23- 12 years and a mean duration of diabetes of 7_ 6 years. Compared to the Chinese normative data, the SAS standard score was significantly higher, whereas SDS standard score had no statistical significance. The SAS standard score was most highly correlated with diabetes duration （y = 0.547, P = 0.011）. Additionally, 19.5% of the patients had moderate or even severe diabetes-related distress and 21.4% had moderate or even severe emo- tional burden while 26.2% had regimen-related distress. Multiple stepwise regression analysis showed that the mean correlation between DDS and the four domains was high, particularly the emotional burden domain （esti- mated D = 0.363, P 〈 0.001） and regimen-related distress domain （estimated 13 = 0.356, P 〈 0.001）. The correlation between SAS and DDS was positive （estimated 13 = 0.039, P = 0.027）. In conclusion, the results showed the im- portance of psychological aspects in Chinese individuals with type 1 diabetes. Screening and treatment of psycho- logical aspects may result in better adherence and increased quality of life for patients with diabetes.
基金NSF of China !(#29773037 )NSF of Fujian province!(#E9910001 )opening project grant from the State Key Lab of phys. Chem.
文摘A novel ammonia synthesis catalyst, potassium-promoted ruthenium supported on carbon nanotubes, was developed. It was found that the Ru-K/carbon nanotubes catalyst had higher activity for ammonia synthesis (20.85 ml NH3/h/g-cat) than the Ru-K/fullerenes ( 13.3 ml NH3/h/g-cat) at atmospheric pressure and 623 K. The catalyst had activity even at 473 K, and had the highest activity( 23.46 ml NH3/h/g-cat) at 643 K. It was suggested that the multi-walled structure favored the electron transfer, the hydrogen-storage and the hydrogen-spill which were favorable to ammonia synthesis.
基金sponsored by Natural Science Foundation of Shanghai (NO.22ZR1431900)Science and Technology on Reactor System Design Technology Laboratory.
文摘Transplutonium isotopes are scarce and need to be produced by irradiation in high flux reactors.However,their production is inefficient,and optimization studies are necessary.This study analyzes the physical nature of transplutonium isotope produc-tion using ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu as examples.Traditional methods based on the Monte Carlo burnup calculation have the limitations of many calculations and cannot analyze the individual energy intervals in detail;thus,they cannot sup-port the refined evaluation,screening,and optimization of the irradiation schemes.After understanding the physical nature and simplifying the complexity of the production process,we propose a rapid diagnostic method for evaluating radiation schemes based on the concepts“single energy interval value(SEIV)”and“energy spectrum total value(ESTV)”.The rapid diagnostic method not only avoids tedious burnup calculations,but also provides a direction for optimization.The optimal irradiation schemes for producing ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu are determined based on a rapid diagnostic method.Optimal irradiation schemes can significantly improve production efficiency.Compared with the initial scheme,the optimal scheme improved the production efficiency of ^(238)Pu by 7.41 times;^(242)Cm,11.98 times;^(244)Cm,65.20 times;and ^(252)Cf,15.08 times.Thus,a refined analysis of transplutonium isotope production is conducted and provides a theoretical basis for improving production efficiency.
基金financially supported by the National Natural Science Foundation of China(Nos.51001054,51174099,and 51174098)the Natural Science Foundation of Jiangsu Province,China(No.BK2011533)+2 种基金Open Funds of the State Key Laboratory of Metal Matrix Composites of Shanghai Jiao Tong University(No.mmc-kf12-06)the Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences(No.CRYO201106)the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),China
文摘AZ91 magnesium alloy was subjected to a deep cryogenic treatment. X-ray diffraction （XRD）, scanning electronic microscopy （SEM）, and transmission electronic microscopy （TEM） methods were utilized to characterize the composition and microstructure of the treated samples. The results show that after two cryogenic treatments, the quantity of the precipitate hardening β phase increases, and the sizes of the precipitates are refined from 8-10μm to 2-4μm. This is expected to be due to the decreased solubility of aluminum in the matrix at low temperature and the significant plastic deformation owing to internal differences in thermal contraction between phases and grains. The polycrystalline matrix is also noticeably refined, with the sizes of the subsequent nanocrystalline grains in the range of 50-100 nm. High density dislocations are observed to pile up at the grain boundaries, inducing the dynamic recrystallization of the microstructure, leading to the generation of a nanocrystalline grain structure. After two deep cryogenic treatments, the tensile strength and elongation are found to be substantially increased, rising from 243 MPa and 4.4% of as-cast state to 299 MPa and 5.1%.
基金supported by the Specialized Research Fund for the Basic Scientific Research of Higher Education of China (27R1204018A)
文摘This paper discussed the optimization of conditions for remediation of crude oil-polluted soil based on pot experiment by applying reed-specific degrading bacteria, and using response surfaces methodology. We took the initial crude oil concentration, the amount of inoculation, the ratio of nitrogen and phosphorus, and the use of surfactant （Tween-80） as independent variables （factors）, and the degrading ratio of crude oil as the dependent variable （response） after a 90-day experiment. The experiment explored the impacts of each independent variable and their interactions on the bioremediation of crude oil-polluted soil using the Box-Behnken design. Working with a simulated forecasting model the study obtained optimization va reed＋specific degrading bacteria, a nitrogen to phosphorus ues for the treatment parameters of 200 g/kg of the ratio of about 6.0. and 0.2% surfactant. Under experimental conditions, for crude oil concentrations of 10, 30 and 50 g/kg, the optimal effects of the treatments achieved 71.87%, 66.61% and 54.52% degradation of the crude oil, respectively. The results can provide a basis for the technical development of plant-microorganism combined bioremediation of crude oil-polluted soil.
基金Project supported by the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20171442)the China Postdoctoral Science Foundation(Grant No.2018T110480)+2 种基金the Open Foundation of State Key Laboratory of Millimeter Waves,China(Grant No.K202003)the Open Foundation of State Key Laboratory of Luminescent Materials and Devices,China(Grant No.2020-skllmd-03)the Fund from the Research Center of Optical Communications Engineering&Technology,Jiangsu Province,China(Grant No.ZXF201904).
文摘In this paper,we propose a theoretical model of the surface plasmon resonance-based optical fiber biosensor for detecting glucose concentration.The Au/ZnO/WS2 multilayer film is coated around optical fiber.Compared with the conventional surface plasmon resonance sensor,WS2 material can increase the sensitivity of the biosensor.The absorption capacity of WS2 is used to load glucose oxidase by forming a sensitive area to recognize glucose.Refractive index of the solution is calculated and then the concentration of the glucose can be obtained by the correspondence between refractive index and glucose concentration.The highest sensitivity of the SPR biosensor with a structure of 40-nm Au/5-nm ZnO/14 layers of WS2 is 4310 nm/RIU.The proposed WS2-based SPR fiber biosensor has a unique effect on the detection of glucose concentration.It is expected to have potential applications in future medical blood glucose concentration detection.
文摘目的评价外踝远端钩钢板治疗外踝远端骨折的疗效。方法回顾性分析我院自2013年1月至2017年1月收治的单纯外踝远端骨折27例,男性16例,女性11例;年龄25～55岁,平均年龄(38±9)岁。27例均采用外踝远端钩钢板治疗。术后定期随访,采用踝关节活动度(range of motion,ROM)和评分系统评价踝关节功能康复情况。结果 27例中25例获得随访,术后随访19～47个月,平均(31±9)个月。末次随访时,患侧踝关节活动度ROM(包括屈伸、内翻、外翻)较健侧比较,差异均无统计学意义(P>0.05)。Mazur评分平均(88.64±3.41)分,优17例,良6例,可1例,差1例,优良率92.00%。结论外踝远端钩钢板治疗外踝远端骨折可达到解剖复位,固定牢靠,满足早期功能锻练,有利于踝关节功能康复,操作简便,对软组织刺激小。
基金the NSF of China (No.29773037 No. 29933040 and No. 20023001) and the NSF of Fujian province (No. E9910001 and No. E0010006).
文摘Novel silicon nanotubes with inner-diameter of 60-80 nm was prepared using; hydrogen-added dechlorination of SiCl4 followed by chemical vapor deposition (CVD) on a NixMgyO catalyst. The TEM observation showed that the suitable reaction temperature is 973 K for the formation of silicon nanotubes. Most of silicon nanotubes have one open end and some have two closed ends. The shape of nanoscale silicon, however, isa micro-crystal type at 873 K, a rod or needle type at 993 K and an onion-type at 1023 K, respectively.
基金Supported by the Key Research and Development Planning Project of Anhui Province(2022h11020002).
文摘On January 1,2021,the newly revised Archives Law of the People's Republic of China(hereinafter referred to as the new Archives Law)was officially implemented,providing legal protection for archive management,archive work and archive undertaking in the new era.Starting from the relevant provisions of the new Archives Law,the collection of precious meteorological archives was discussed,and it is believed that only on the basis of clarifying the definition,collection responsibility subject,collection scope,ways and methods of precious meteorological archives can the relevant units be convenient to practice and obtain substantive collection effect.
文摘Background Accurate motion tracking in head-mounted displays(HMDs)has been widely used in immersive VR interaction technologies.However,tracking the head motion of users at all times is not always desirable.During a session of HMD usage,users may make scene-irrelevant head rotations,such as adjusting the head position to avoid neck pain or responding to distractions from the physical world.To the best of our knowledge,this is the first study that addresses the problem of scene-irrelevant head movements.Methods We trained a classifier to detect scene-irrelevant motions using temporal eye head-coordinated information sequences.To investigate the usefulness of the detection results,we propose a technique to suspend motion tracking in HMDs where scene-irrelevant motions are detected.Results/Conclusions Experimental results demonstrate that the scene-relevancy of movements can be detected using eye-head coordination information,and that ignoring scene-irrelevant head motions in HMDs improves user continuity without increasing sickness or breaking immersion.
基金supported in part by Poland Fundacja SiepomagaJS Foundation (Hong Kong)+1 种基金Shenzhen Li Weibo Charity FoundationTaiwan Rare Disease Foundation。
文摘Metachromatic leukodystrophy(MLD)is an inherited disease caused by a deficiency of the enzyme arylsulfatase A(ARSA).Lentivirus-modified autologous hematopoietic stem cell gene therapy(HSCGT)has recently been approved for clinical use in pre and early symptomatic children with MLD to increase ARSA activity.Unfortunately,this advanced therapy is not available for most patients with MLD who have progressed to more advanced symptomatic stages at diagnosis.Patients with late-onset juvenile MLD typically present with a slower neurological progression of symptoms and represent a significant burden to the economy and healthcare system,whereas those with early onset infantile MLD die within a few years of symptom onset.We conducted a pilot study to determine the safety and benefit of HSCGT in patients with postsymptomatic juvenile MLD and report preliminary results.The safety profile of HSCGT was favorable in this long-term follow-up over 9 years.The most common adverse events(AEs)within 2 months of HSCGT were related to busulfan conditioning,and all AEs resolved.No HSCGT-related AEs and no evidence of distorted hematopoietic differentiation during long-term follow-up for up to 9.6 years.Importantly,to date,patients have maintained remarkably improved ARSA activity with a stable disease state,including increased Functional Independence Measure(FIM)score and decreased magnetic resonance imaging(MRI)lesion score.This long-term follow-up pilot study suggests that HSCGT is safe and provides clinical benefit to patients with postsymptomatic juvenile MLD.
