With the rapid development of information technology, the processing methods of accounting bills are also improving. Traditional accounting bill processing methods are cumbersome and error-prone, while modern informat...
详细信息
Rapid interest in identifying specific biomarkers has been sparked by the development of wearable electrochemical sensors for physiological and biological monitoring via noninvasive measurement. During anaerobic metab...
详细信息
Magnesium chips were coated with a high concentration of graphite using a binder and were used as the raw material for injection molding. The microstructure of the magnesium injection-molded product with added graphit...
详细信息
The strength and ductility cannot achieve a good tradeoff for some superalloy(***3536)prepared by selective laser melting(SLM),which seriously restricts their industrial *** work examined the effect of post-heat treat...
详细信息
The strength and ductility cannot achieve a good tradeoff for some superalloy(***3536)prepared by selective laser melting(SLM),which seriously restricts their industrial *** work examined the effect of post-heat treatment(HT)on the microstructure and mechanical properties of GH3536 produced by *** particular,the influence of carbide precipitate morphology and distribution on strength and ductility of the alloy after heat treatment was *** aging at 650°C(denoted as HT1),the Cr23C6 carbides were distributed in *** ductility increased by approximately 31%,while the strength slightly *** aging at 745°C(denoted as HT2),the Cr23C6 carbides were distributed in ***,the HT2 samples showed an increase in ductility of~58%and no reduction in *** the dislocation density of HT2 sample was higher than that of the HT1 sample,the chain carbides could be pinned to the grain boundaries,consequently improving the ductility but no loss in strength as compared with the as-deposited *** the aging temperature was increased to 900°C(denoted as HT3),the carbides were distributed in a discontinuous granular *** a result,the HT3 samples presented the lowest dislocation density which reduced the strength.
To investigate the coupled damage mechanism of blunt impact and bullets penetration after penetrating ballistic plates against human body targets,experiments were conducted using 6.8 mm caliber armor-piercing bullets ...
详细信息
To investigate the coupled damage mechanism of blunt impact and bullets penetration after penetrating ballistic plates against human body targets,experiments were conducted using 6.8 mm caliber armor-piercing bullets against gelatin targets with protective coatings.A numerical analysis model was developed to simulate bullet penetration into gelatin with protective coatings,obtaining endpoint characteristic quantities such as bullet velocity changes,changes in energy distribution,pressure,stress,and stress wave variations within the gelatin target after *** results indicate that at a velocity of 640 m·s^(-1),the 6.8 mm caliber armor-piercing round failed to penetrate the ballistic plate yet still caused a blunt impact depression of 37 mm in *** conditions where the bullet did not penetrate the ballistic plate,approximately 80%of the bullet's kinetic energy was absorbed by the ballistic *** a velocity of 740 m·s^(-1),the bullet penetrated the ballistic plate,resulting in a blunt impact depression depth of 56 mm and an instantaneous cavity with a maximum diameter of 60 *** the process of penetrating the ballistic plate,approximately 50%of the bullet's kinetic energy was absorbed by the ballistic plate,and about 40%of the remaining kinetic energy transferred into the gelatin during the penetration of the target.
The brain-computer interface(BCI)system serves as a critical link between external output devices and the human brain.A monitored object's mental state,sensory cognition,and even higher cognition are reflected in ...
详细信息
The brain-computer interface(BCI)system serves as a critical link between external output devices and the human brain.A monitored object's mental state,sensory cognition,and even higher cognition are reflected in its electroencephalography(EEG)***,unprocessed EEG signals are frequently contaminated with a variety of artifacts,rendering the analysis and elimination of impurities from the collected EEG data exceedingly challenging,not to mention the manual adjustment *** the last few decades,the rapid advancement of artificial intelligence(AI)technology has contributed to the development of BCI *** derived from AI and machine learning have significantly enhanced the ability to analyze and process EEG electrical signals,thereby expanding the range of potential interactions between the human brain and *** a result,the present BCI technology with the help of AI can assist physicians in gaining a more comprehensive understanding of their patients'physical and psychological status,thereby contributing to improvements in their health and quality of life.
The transition from traditional pedagogy to self-learning represents a significant shift in educational practice, propelled by technological advancements and the evolving needs of learners. This study explores the evo...
详细信息
Garnet solid electrolytes are one of the most promising electrolytes for solid-state ***,Li_(2)CO_(3) is a critical issue that hinders the practical application of garnet-based solid-state lithium-ion *** are two sour...
详细信息
Garnet solid electrolytes are one of the most promising electrolytes for solid-state ***,Li_(2)CO_(3) is a critical issue that hinders the practical application of garnet-based solid-state lithium-ion *** are two sources of Li_(2)CO_(3) *** main one is the aging of garnet electrolytes in the *** electrolytes can react with H_(2)O and CO_(2) in the air to form Li_(2)CO_(3),which reduces ion conductivity,increases electrode/garnet electrolyte interface resistance,and deteriorates the electrochemical performance of the *** strategies,such as elemental doping,grain boundary manipulation,and interface engineering,have been suggested to address these *** other is the passivation layer(Li_(2)CO_(3),Li_3N,LiOH,Li_(2)O) formed on the surface of the lithium foil after long-term storage,which is ignored by most *** better understand the current strategies and future trends to address the Li_(2)CO_(3) problem,this perspective provides a systematic review of journals published in this field from 2020-2023.
The hydrolysis of MgH_(2) delivers high hydrogen capacity(15.2 wt%),which is very attractive for real-time hydrogen ***,the formation of a surface passivation Mg(OH)_(2) layer and the large excess of H_(2)O required t...
详细信息
The hydrolysis of MgH_(2) delivers high hydrogen capacity(15.2 wt%),which is very attractive for real-time hydrogen ***,the formation of a surface passivation Mg(OH)_(2) layer and the large excess of H_(2)O required to ensure complete hydrolysis are two key challenges for the MgH_(2) hydrolysis ***,a low-cost method is reported to synthesize MgH_(2)@Mg(BH_(4))_(2) composite via ball-milling MgH_(2) with cheap and widely available B_(2)O_(3)(or B(OH)_(3)).By adding small amounts of B_(2)O_(3),the in-situ formed Mg(BH_(4))_(2) could significantly promote the hydrolysis of MgH_(2).In particular,the MgH_(2)–10 wt%B_(2)O_(3) composite releases 1330.7 mL·g^(−1) H_(2)(close to 80%theoretical hydrogen generation H_(2))in H_(2)O and 1520.4 mL·g^(−1) H_(2)(about 95%)in 0.5 M MgCl_(2) in 60 min at 26℃ with hydrolysis rate of 736.9 mL·g^(−1)·min^(−1) and 960.9 mL·g^(−1)·min^(−1) H_(2) during the first minute of the hydrolysis,*** addition,the MgCl_(2) solution allows repeated use by filtering and exhibits high cycle stability(20 cycles),therefore leading to much reduced capacity loss caused by the excess H_(2)*** show that by introducing B_(2)O_(3) and recycling the 0.5 M MgCl_(2) solution,the system hydrogen capacity can approach 5.9 wt%,providing a promising hydrogen generation scheme to supply hydrogen to the fuel cells.
Successful drought planning is dependent on the generation of timely and accurate early warning *** there is little evidence to explain the extent to which crop farmers pay attention to and assimilate early warning dr...
详细信息
Successful drought planning is dependent on the generation of timely and accurate early warning *** there is little evidence to explain the extent to which crop farmers pay attention to and assimilate early warning drought information that aids in the policy formulation in support of drought risk reduction.A socioecological survey,using a structured questionnaire administered to 426 crop farming households,was carried out in the Talensi District of the Upper East Region,*** data analytic techniques used were frequency tables,relative importance index,and multinomial logistics embedded in SPSS v.20 *** results show that crop farmers predominantly rely on agricultural extension officers for early warning drought information,with an estimated 78% of them paying little to very much attention to the *** likelihood ratio Chi-square test showed that there is a significant improvement in fit as X^(2)(20)=96.792,p<*** status,average monthly income,and age were the significant predictors for crop farmers paying no attention at all to early warning drought information,while household status was the only significant factor among those paying a little *** drive to build a climate-resilient society with effective early warning centers across Ghana will receive 60% lower support from crop farmers paying no to a little attention as compared to farmers paying very much attention to early warning drought *** stakeholder engagements should be carried out to harness inclusive support from crop farmers to build a climate-resilient society in Ghana.
暂无评论