Background:Live streaming has become a globally prevalent form of digital entertainment,particularly among young audiences,fostering new modes of online engagement through real-time interaction.However,excessive use m...Background:Live streaming has become a globally prevalent form of digital entertainment,particularly among young audiences,fostering new modes of online engagement through real-time interaction.However,excessive use may lead to addictive behaviors in certain users.Current research on live-streaming addiction remains limited,with prior studies focusing primarily on socio-psychological drivers rather than the role of technological affordances.To address this gap,this study develops a conceptual model based on socio-technical systems and attachment theory to investigate how emotional and functional attachment mediate the relationship between platform features and addictive behavior.Methods:A total of 533 valid responses were collected in a cross-sectional survey(mean age=26.4 years,standard deviation[SD]=4.7;53.8%female).Data were analyzed using structural equation modeling(SEM)to test the hypothesized relationships.Additionally,the potential mediating effects of emotional and functional attachment between the platform features and live-streaming addiction were examined using the Bootstrap method.Results:Social factors(perceived interactivity,β=0.204,p<0.001;perceived confirmation,β=0.379,p<0.001)and technical factors(perceived customization,β=0.227,p<0.001;perceived amusement,β=0.252,p<0.001;vicarious expression,β=0.352,p<0.001)significantly strengthen both emotional and functional attachment,which in turn positively predict live-streaming addiction(emotional attachment:β=0.468,p<0.001;functional attachment:β=0.393,p<0.001).Furthermore,emotional attachment exerted a stronger influence on addiction than functional attachment.Conclusions:These findings deepen the understanding of live-streaming addiction by integrating socio-technical perspectives and offer practical implications for stakeholders to mitigate negative outcomes through effective strategies.展开更多
BACKGROUND The primary issue in managing edentulous patients is the severely resorbed mandibular ridge,particularly in older individuals with diminished adaptive capacities.This compromised situation leads to the fabr...BACKGROUND The primary issue in managing edentulous patients is the severely resorbed mandibular ridge,particularly in older individuals with diminished adaptive capacities.This compromised situation leads to the fabrication of inadequate dentures that lack retention and stability,potentially causing psychosocial issues.AIM To determine the difference in retentive capacity between three attachment systems in implant-retained overdentures.METHODS Three edentulous mandibular models were fabricated using heat-cured polymethacrylate resin,with two implant replicas placed in the intra-foraminal region of each model.30 acrylic resin mandibular overdentures were fabricated with provisions for three different overdenture attachment systems:A prefabricated ball/O-ring attachment,a locator attachment system,and an equator attachment system.Each model was subjected to 15000 pulls using a universal testing machine to remove the overdenture from the acrylic model and the force data were recorded.RESULTS The ball/O-ring attachment system demonstrated superior retentive capacity for 15 years,while the locator and equator attachment systems maintained excellent retentive capacity for 5 years.CONCLUSION The ball/O-ring attachment system outperformed better than the other two attachment systems regarding retentive capacity.The locator and equator attachment systems presented sufficient retentive abilities until 15000 cycles.After 7500 cycles,significant differences in retentive force between the systems evolved.展开更多
Octopuses,due to their flexible arms,marvelous adaptability,and powerful suckers,are able to effortlessly grasp and disengage various objects in the marine surrounding without causing devastation.However,manipulating ...Octopuses,due to their flexible arms,marvelous adaptability,and powerful suckers,are able to effortlessly grasp and disengage various objects in the marine surrounding without causing devastation.However,manipulating delicate objects such as soft and fragile foods underwater require gentle contact and stable adhesion,which poses a serious challenge to now available soft grippers.Inspired by the sucker infundibulum structure and flexible tentacles of octopus,herein we developed a hydraulically actuated hydrogel soft gripper with adaptive maneuverability by coupling multiple hydrogen bond-mediated supramolecular hydrogels and vat polymerization three-dimensional printing,in which hydrogel bionic sucker is composed of a tunable curvature membrane,a negative pressure cavity,and a pneumatic chamber.The design of the sucker structure with the alterable curvature membrane is conducive to realize the reliable and gentle switchable adhesion of the hydrogel soft gripper.As a proof-of-concept,the adaptive hydrogel soft gripper is capable of implement diversified underwater tasks,including gingerly grasping fragile foods like egg yolks and tofu,as well as underwater robots and vehicles that station-keeping and crawling based on switchable adhesion.This study therefore provides a transformative strategy for the design of novel soft grippers that will render promising utilities for underwater exploration soft robotics.展开更多
The objective of this study is to investigate the improvement possibilities of the floatability of galena with ultrasonic application in the presence of potassium ethyl xanthate(KEX). For this purpose, micro-flotation...The objective of this study is to investigate the improvement possibilities of the floatability of galena with ultrasonic application in the presence of potassium ethyl xanthate(KEX). For this purpose, micro-flotation experiments were carried out in addition to surface chemistry studies including zeta potential, contact angle, and bubble-particle attachment time measurements at various ultrasonic power levels and conditioning time. The results showed that, the maximum micro-flotation recovery of 77.5% was obtained with 30 W ultrasound power and 2 min conditioning time. In addition, more negative zeta potential values were obtained with ultrasound as well as higher contact angle and lower bubble-particle attachment time, which indicated the increased hydrophobicity of galena with ultrasound.展开更多
Objectives: Social relationships throughout lifespan are critical for health and wellbeing.Oxytocin,often called the'hormone of attachment'has been suggested as playing an important role in early-life nurturin...Objectives: Social relationships throughout lifespan are critical for health and wellbeing.Oxytocin,often called the'hormone of attachment'has been suggested as playing an important role in early-life nurturing and resulting social bonding.The objective of this paper is to synthesize the associations between oxytocin levels and interactions between infants and parents that may trigger oxytocin release,and in turn facilitate attachments.Methods: A comprehensive cross-disciplinary systematic search was completed using electronic data-bases.The inclusion criteria included studies that focused on mother-infant and father-infant interaction and measured both baseline and post-interaction oxytocin levels.Results: Seventeen studies were included in the final systematic review.The reviewed studies used mother-infant and/or father-infant play and skin-to-skin contact between maternal-infant and paternalinfant dyads to examine the oxytocin role in early life bonding and parenting processes.Studies showed a positive correlation between parent-infant contact and oxytocin levels in infancy period.Increased maternal oxytocin levels were significantly related to more affectionate contact behaviors in mothers following mother-infant contact,synchrony,and engagement.Meanwhile,increased paternal oxytocin levels were found to be related to more stimulatory contact behaviors in fathers following father-infant contact.Oxytocin levels significantly increased in infants,mothers and fathers during skin-to-skin contact and parents with higher oxytocin levels exhibited more synchrony and responsiveness in their infant interactions.Conclusion: The review suggests that oxytocin plays an important role in the development of attachment between infants and parents through early contact and interaction.The complexities of oxytocinergic mechanisms are rooted in neurobiological,genetic,and social factors.展开更多
In order to theoretically study the growth morphology of dihydroxylammonium 5,5’-bistetrazole-1,1’-dio late(TKX-50)crystal in different solvent systems,crystal–solvent models were established,and then molecular dyn...In order to theoretically study the growth morphology of dihydroxylammonium 5,5’-bistetrazole-1,1’-dio late(TKX-50)crystal in different solvent systems,crystal–solvent models were established,and then molecular dynamics(MD)methods were adopted as a means to simulate particle motion.Modified attachment energy(MAE)model was employed to calculate the growth morphology of TKX-50.The simulation results demonstrate that COMPASS force field and RESP charge are suitable for molecular dynamics simulation of TKX-50.The morphologically dominant growth surfaces of TKX-50 in vacuum are(020),(011),(11–1),(100)and(120),respectively.In water(H_(2)O)and N,N-dimethylformamide(DMF)solvents,the(11–1)face is the largest in the habit face,the growth rate of(020)face becomes faster.With the increase of temperature,the aspect ratios of TKX-50 crystal in DMF solvent increase,and the areas of the(120)faces decrease.In ethylene glycol/H_(2)O mixed solvent system with volume ratio of 1/1,aspect ratio of TKX-50 is relatively small.In formic acid/H_(2)O mixed solvents with different volume ratios(1/4,1/3,1/2,1/1 and 2/1),aspect ratio of TKX-50 is relatively small when volume ratio is 1/2.展开更多
Network attached storage (NAS) with the properties of improved scalability, simplified management, low cost and balanced price performance, is desirable for high performance storage systems applied to extensive area...Network attached storage (NAS) with the properties of improved scalability, simplified management, low cost and balanced price performance, is desirable for high performance storage systems applied to extensive areas. Unfortunately, it also has some disadvantages such as increased network workload, and inconvenience in disaster recovery. To overcome these disadvantages, we propose a channel bonding technique and provide hot backup functions in the designed NAS system, named HUSTserver. Channel bonding means merging multiple Ethernet channels into integrated one, and that the data packets can be transferred through any available network channels in a parallel mode. The hot backup function provides automatic data mirroring among servers. In this paper, we first describe the whole system prototype from a software and hardware architecture view. Then, multiple Ethernet and hot backup technologies that distinguish HUSTserver from others are discussed in detail. The findings presented demonstrate that network bandwidth can be scaled by the use of multiple commodity networks. Dual parallel channels of commodity 100 Mbps Ethernet are both necessary and sufficient to support the data rates of multiple concurrent file transfers. And the hot backup function introduced in our system provides high data accessibility.展开更多
The column bioleaching of copper flotation tailings was comparatively investigated using layered heap construction method(LM),agglomerate heap construction method(AM),and pellets-sintering heap construction method(PM)...The column bioleaching of copper flotation tailings was comparatively investigated using layered heap construction method(LM),agglomerate heap construction method(AM),and pellets-sintering heap construction method(PM).The bacterial communities of free,attached,weakly-attached,and strongly-attached microbes in the later bioleaching stage were investigated.In AM group,the addition of lump sulphide ore resulted in the low leachate pH,high ferric iron concentration,and rapid microbial adsorption,which obtained the maximum copper extraction(60.1%)compared with LM(54.6%)and PM(43.9%)groups.The relative abundance of dominant genera and microbial communities of different microbiota underwent changes in three heap construction methods.The alpha-diversity indexes of attached,weakly-attached,and strongly-attached microbes were different,while no significant change was observed in free bacteria.The variation of whole bacterial community was significantly associated with solution pH,total iron,and ferric iron concentrations.Pearson correlation analysis and partial least square path model both indicated that attached bacteria made larger contribution to the copper extraction of tailings.展开更多
With the incorporation of renewable energy,load frequency control(LFC)becomes more challenging due to uncertain power generation and changeable load demands.The electric vehicle(EV)has been a popular transportation an...With the incorporation of renewable energy,load frequency control(LFC)becomes more challenging due to uncertain power generation and changeable load demands.The electric vehicle(EV)has been a popular transportation and can also provide flexible options to play a role in frequency regulation.In this paper,a novel adaptive composite controller is designed to solve the LFC problem for the interconnected power system with electric vehicles and wind turbine.EVs are used as regulation resources to effectively compensate the power mismatch.First,the sliding mode controller is developed to reduce the random influences caused by the wind turbine generation system.Second,an auxiliary controller with reinforcement learning is proposed to produce adaptive control signals,which will be attached to the primary proportion-integration-differentiation control signal in a realtime manner.Finally,by considering random wind power,load disturbances and output constraints,the proposed scheme is verified on a two-area power system under four different cases.Simulation results demonstrate that the proposed adaptive composite frequency control scheme has a competitive performance with regard to dynamic performance.展开更多
General Great importance is being attached in the electric power in-dustry to the inspection of rotor shafts. This is because defects areusually concentrated at the central part of large forgings for makingrotors, som...General Great importance is being attached in the electric power in-dustry to the inspection of rotor shafts. This is because defects areusually concentrated at the central part of large forgings for makingrotors, some remnants of them may still remain after the centre borehas been drilled. Some rotors even have quite a number of defects atlocations rather remote from the centre bore. Working conditions for steam turbine rotors are very ex-展开更多
AIM To evaluate appropriate and rapid polyglycolic acid sheet(PGAs) covering time using device delivery station system(DDSS).METHODS This pilot basic study was conducted to evaluate the potential of accurate and rapid...AIM To evaluate appropriate and rapid polyglycolic acid sheet(PGAs) covering time using device delivery station system(DDSS).METHODS This pilot basic study was conducted to evaluate the potential of accurate and rapid PGAs delivery using DDSS. Three 11-month-old female Beagle dogs were used in this study. Two endoscopic submucosal dissections(ESDs) 4 cm in diameter were performed in lesser curvature of middle gastric body and greater curvature of antrum(total 6 ESDs performed). DDSS(3 cm length, 12 mm in outer diameter) has 2 chambers which 16 cm^2 large 2 PGAs were stored, and DDSS was attached post ESD ulcers, respectively. Beriplast P?(CSL Behring K.K., Tokyo, Japan)(combination of fibringlue and thrombin) was applied equally to the artificial ulcer, and tight attachment of 2 PGAs with DDSS were completed. The evaluation items were covering times, post ESD bleeding and perforation during ESD.RESULTS The covering time of PGAs(defined as the duration from the beginning of endoscope insertion into the mouth to the end of the fibrin glue coating process) was 6.07(4.86-8.29) min. There was no postESD bleeding(1-7 d after ESD), and there was no perforation during ESD.CONCLUSION DDSS was very useful for rapid delivering and tight attachment of PGAs, and has potentials of multipurpose delivery station system.展开更多
Salamanders have evolved functions of attaching to a variety of surfaces under wet conditions,but racial diversity may cause a difference in attachment behaviors and epidermal characteristics.The sticking and climbing...Salamanders have evolved functions of attaching to a variety of surfaces under wet conditions,but racial diversity may cause a difference in attachment behaviors and epidermal characteristics.The sticking and climbing abilities of the Chinese Fire Belly Newt(CFBN),Chinese Warts Triton(CWT),Spotless Stout Newt(SSN),and Chinese Giant Salamander(CGS)on various surfaces were investigated and compared in terms of epidermal morphology,body size,and wettability.The results indicate that the spotless stout newt has an excellent ability for wet attachment,compared to other salamanders under a certain contact case,resulting from its lower mass/body surface area and more visible epidermal structures.Supplementation with moderate water is beneficial for salamander attachment,and the surface roughness in the flood case also promotes the wet attachment.The CFBN has the most hydrophilic epidermis among the samples,where the water droplet quickly spreads over,presenting a completely wetting case.This study offers a comprehensive understanding of the wet attachments and the epidermal characteristics of salamanders,which is meaningful for the application of bioinspired adhesives.展开更多
In order to understand the biological community characteristics of different surface treatments of ＇artificial reef templates ,which had been placed on the offshore, Yuanzhou island, Daya Bay. Sampling survey was tak...In order to understand the biological community characteristics of different surface treatments of ＇artificial reef templates ,which had been placed on the offshore, Yuanzhou island, Daya Bay. Sampling survey was taken in August of 2014. The results showed that 39 species of fouling organisms were collected and iden- tiffed, Ostrea nigromarginata has attached the absolute position of the dominant species ; Through the concrete block surface treatment has a better biofouling effect, and red brick, granite plates and no-surface-treated concrete template attached biomass and abundance of organisms were very low ; Biomass and abundance indices and ecological indices do not show a certain degree of regularity.展开更多
Since the pioneering work by Panksepp et al,the neurobiological bases of attachment behavior have been closely linked with opioid neurotransmission.Candidate gene studies of adult individuals have shown that variation...Since the pioneering work by Panksepp et al,the neurobiological bases of attachment behavior have been closely linked with opioid neurotransmission.Candidate gene studies of adult individuals have shown that variation in the muopioid receptor gene(OPRM1)influences attachment behavior.Early maternal care and the A/A genotype of the A118G polymorphism interact in modulating levels of fearful attachment.Compared to their counterparts carrying the A/A genotype,individuals expressing the minor 118G allele show lower levels of avoidant attachment and experience more pleasure in social situations.Brain imaging research has strengthened the biological plausibility of candidate gene studies.The avoidance dimension of attachment correlates negatively with muopioid receptor availability in the thalamus and anterior cingulate cortex,as well as the frontal cortex,amygdala,and insula.Overall,findings from human studies combined with those from animal models suggest that research on the genetic bases of attachment should include the endogenous opioid system among the investigated variables.展开更多
Security environment is both an objective reality and a subjective consciousness. Here so-called "objective reality" mainly refers to the inherent law of the changes in international security situation. To a...Security environment is both an objective reality and a subjective consciousness. Here so-called "objective reality" mainly refers to the inherent law of the changes in international security situation. To a great extent, the subjective consciousness of the objective reality depends on the position and strategic choices of a nation in the international展开更多
Network storage increase capacity and scalability of storage system, data availability and enables the sharing of data among clients. When the developing network technology reduce performance gap between disk and netw...Network storage increase capacity and scalability of storage system, data availability and enables the sharing of data among clients. When the developing network technology reduce performance gap between disk and network, however, mismatched policies and access pattern can significantly reduce network storage performance. So the strategy of data placement in system is an important factor that impacts the performance of overall system. In this paper, the two algorithms of file assignment are presented. One is Greed partition that aims at the load balance across all NADs (Network Attached Disk). The other is Sort partition that tries to minimize variance of service time in each NAD. Moreover, we also compare the performance of our two algorithms in practical environment. Our experimental results show that when the size distribution (load characters) of all assigning files is closer and larger, Sort partition provides consistently better response times than Greedy algorithm. However, when the range of all assigning files is wider, there are more small files and access rate is higher, the Greedy algorithm has superior performance in compared with the Sort partition in off-line.展开更多
With development of networked storage and its applications, united storage network (USN) combined with network attached storage (NAS) and storage area network (SAN) has emerged. It has such advantages as high performa...With development of networked storage and its applications, united storage network (USN) combined with network attached storage (NAS) and storage area network (SAN) has emerged. It has such advantages as high performance, low cost, good connectivity, etc. However the security issue has been complicated because USN responds to block I/O and file I/O requests simultaneously. In this paper, a security system module is developed to prevent many types of attacks against USN based on NAS head. The module not only uses effective authentication to prevent unauthorized access to the system data, but also checks the data integrity. Experimental results show that the security module can not only resist remote attacks and attacks from those who has physical access to the USN, but can also be seamlessly integrated into underlying file systems, with little influence on their performance.展开更多
Effects of operating conditions and device's geometrical sizes on geometrical properties of wall-attaching transonic jet between two parallel plat plates are numerically simulated. Conclusions are as follows: 1) U...Effects of operating conditions and device's geometrical sizes on geometrical properties of wall-attaching transonic jet between two parallel plat plates are numerically simulated. Conclusions are as follows: 1) Upriver part of the wall-attaching jet's center streamline is in good accordance with parabola; 2) When both gas inlet pressure and outlet pressure as well as their ratio are not too high ( the outlet pressure is less than 10 MPa and the pressure ratio is less than 3), the center streamlines of the wall-attaching jet with the same pressure ratio coincide with each other very well, and the deflection degree of the center streamline decreases with rise of the pressure ratio; 3) The deflection degree of the jet's center streamline decreases with either broadening of nozzle's throat or rise of wall offset; 4) With rise of the pressure ratio, attachment distance of the jet increases, but the increase rate descends; 5) The attachment distance ascends with rise of either the nozzle's throat or the wall offset.展开更多
The Network Attachment Subsystem (NASS) is introduced to the Next Generation Network (NGN) architecture to enable services independent from access networks and support nomadism for fixed terminals. The NASS is respons...The Network Attachment Subsystem (NASS) is introduced to the Next Generation Network (NGN) architecture to enable services independent from access networks and support nomadism for fixed terminals. The NASS is responsible for managing the users attached to the access network in terms of user authentication, allocation of the IP address, and location management. In NGN R1, Telecommunications and Internet Converged Services and Protocols for Advanced Networking (TISPAN) studied the internal architecture and external interface protocols of NASS and published the relevant technical specifications. In NGN R2, TISPAN focuses on the study of mobility and nomadism as well as the ability to support various access network architectures. There still remain several issues that need further study.展开更多
基金funded by the Social Science Major Project of Tianjin Municipal Education Commission(Grant No.2025JWZD-GJ26).
文摘Background:Live streaming has become a globally prevalent form of digital entertainment,particularly among young audiences,fostering new modes of online engagement through real-time interaction.However,excessive use may lead to addictive behaviors in certain users.Current research on live-streaming addiction remains limited,with prior studies focusing primarily on socio-psychological drivers rather than the role of technological affordances.To address this gap,this study develops a conceptual model based on socio-technical systems and attachment theory to investigate how emotional and functional attachment mediate the relationship between platform features and addictive behavior.Methods:A total of 533 valid responses were collected in a cross-sectional survey(mean age=26.4 years,standard deviation[SD]=4.7;53.8%female).Data were analyzed using structural equation modeling(SEM)to test the hypothesized relationships.Additionally,the potential mediating effects of emotional and functional attachment between the platform features and live-streaming addiction were examined using the Bootstrap method.Results:Social factors(perceived interactivity,β=0.204,p<0.001;perceived confirmation,β=0.379,p<0.001)and technical factors(perceived customization,β=0.227,p<0.001;perceived amusement,β=0.252,p<0.001;vicarious expression,β=0.352,p<0.001)significantly strengthen both emotional and functional attachment,which in turn positively predict live-streaming addiction(emotional attachment:β=0.468,p<0.001;functional attachment:β=0.393,p<0.001).Furthermore,emotional attachment exerted a stronger influence on addiction than functional attachment.Conclusions:These findings deepen the understanding of live-streaming addiction by integrating socio-technical perspectives and offer practical implications for stakeholders to mitigate negative outcomes through effective strategies.
文摘BACKGROUND The primary issue in managing edentulous patients is the severely resorbed mandibular ridge,particularly in older individuals with diminished adaptive capacities.This compromised situation leads to the fabrication of inadequate dentures that lack retention and stability,potentially causing psychosocial issues.AIM To determine the difference in retentive capacity between three attachment systems in implant-retained overdentures.METHODS Three edentulous mandibular models were fabricated using heat-cured polymethacrylate resin,with two implant replicas placed in the intra-foraminal region of each model.30 acrylic resin mandibular overdentures were fabricated with provisions for three different overdenture attachment systems:A prefabricated ball/O-ring attachment,a locator attachment system,and an equator attachment system.Each model was subjected to 15000 pulls using a universal testing machine to remove the overdenture from the acrylic model and the force data were recorded.RESULTS The ball/O-ring attachment system demonstrated superior retentive capacity for 15 years,while the locator and equator attachment systems maintained excellent retentive capacity for 5 years.CONCLUSION The ball/O-ring attachment system outperformed better than the other two attachment systems regarding retentive capacity.The locator and equator attachment systems presented sufficient retentive abilities until 15000 cycles.After 7500 cycles,significant differences in retentive force between the systems evolved.
基金the financial support from the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB0470303)the National Key Research and Development Program of China (2022YFB4600101)+5 种基金the National Natural Science Foundation of China (52175201)the Research Program of Science and Technology Department of Gansu Province (24JRRA059, 24JRRA044, and 24YFFA014)the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai (AMGM2024F12)the Major Program (ZYFZFX-2) of the Lanzhou Institute of Chemical Physics, CASthe Special Research Assistant Project of the Chinese Academy of Sciencesthe Oasis Scholar of Shihezi University
文摘Octopuses,due to their flexible arms,marvelous adaptability,and powerful suckers,are able to effortlessly grasp and disengage various objects in the marine surrounding without causing devastation.However,manipulating delicate objects such as soft and fragile foods underwater require gentle contact and stable adhesion,which poses a serious challenge to now available soft grippers.Inspired by the sucker infundibulum structure and flexible tentacles of octopus,herein we developed a hydraulically actuated hydrogel soft gripper with adaptive maneuverability by coupling multiple hydrogen bond-mediated supramolecular hydrogels and vat polymerization three-dimensional printing,in which hydrogel bionic sucker is composed of a tunable curvature membrane,a negative pressure cavity,and a pneumatic chamber.The design of the sucker structure with the alterable curvature membrane is conducive to realize the reliable and gentle switchable adhesion of the hydrogel soft gripper.As a proof-of-concept,the adaptive hydrogel soft gripper is capable of implement diversified underwater tasks,including gingerly grasping fragile foods like egg yolks and tofu,as well as underwater robots and vehicles that station-keeping and crawling based on switchable adhesion.This study therefore provides a transformative strategy for the design of novel soft grippers that will render promising utilities for underwater exploration soft robotics.
基金the Research Fund of Istanbul University under grant FAB-2017-25658.
文摘The objective of this study is to investigate the improvement possibilities of the floatability of galena with ultrasonic application in the presence of potassium ethyl xanthate(KEX). For this purpose, micro-flotation experiments were carried out in addition to surface chemistry studies including zeta potential, contact angle, and bubble-particle attachment time measurements at various ultrasonic power levels and conditioning time. The results showed that, the maximum micro-flotation recovery of 77.5% was obtained with 30 W ultrasound power and 2 min conditioning time. In addition, more negative zeta potential values were obtained with ultrasound as well as higher contact angle and lower bubble-particle attachment time, which indicated the increased hydrophobicity of galena with ultrasound.
文摘Objectives: Social relationships throughout lifespan are critical for health and wellbeing.Oxytocin,often called the'hormone of attachment'has been suggested as playing an important role in early-life nurturing and resulting social bonding.The objective of this paper is to synthesize the associations between oxytocin levels and interactions between infants and parents that may trigger oxytocin release,and in turn facilitate attachments.Methods: A comprehensive cross-disciplinary systematic search was completed using electronic data-bases.The inclusion criteria included studies that focused on mother-infant and father-infant interaction and measured both baseline and post-interaction oxytocin levels.Results: Seventeen studies were included in the final systematic review.The reviewed studies used mother-infant and/or father-infant play and skin-to-skin contact between maternal-infant and paternalinfant dyads to examine the oxytocin role in early life bonding and parenting processes.Studies showed a positive correlation between parent-infant contact and oxytocin levels in infancy period.Increased maternal oxytocin levels were significantly related to more affectionate contact behaviors in mothers following mother-infant contact,synchrony,and engagement.Meanwhile,increased paternal oxytocin levels were found to be related to more stimulatory contact behaviors in fathers following father-infant contact.Oxytocin levels significantly increased in infants,mothers and fathers during skin-to-skin contact and parents with higher oxytocin levels exhibited more synchrony and responsiveness in their infant interactions.Conclusion: The review suggests that oxytocin plays an important role in the development of attachment between infants and parents through early contact and interaction.The complexities of oxytocinergic mechanisms are rooted in neurobiological,genetic,and social factors.
基金supported by Fundamental Research Program of Shanxi Province(20210302123055)and(201801D221035).
文摘In order to theoretically study the growth morphology of dihydroxylammonium 5,5’-bistetrazole-1,1’-dio late(TKX-50)crystal in different solvent systems,crystal–solvent models were established,and then molecular dynamics(MD)methods were adopted as a means to simulate particle motion.Modified attachment energy(MAE)model was employed to calculate the growth morphology of TKX-50.The simulation results demonstrate that COMPASS force field and RESP charge are suitable for molecular dynamics simulation of TKX-50.The morphologically dominant growth surfaces of TKX-50 in vacuum are(020),(011),(11–1),(100)and(120),respectively.In water(H_(2)O)and N,N-dimethylformamide(DMF)solvents,the(11–1)face is the largest in the habit face,the growth rate of(020)face becomes faster.With the increase of temperature,the aspect ratios of TKX-50 crystal in DMF solvent increase,and the areas of the(120)faces decrease.In ethylene glycol/H_(2)O mixed solvent system with volume ratio of 1/1,aspect ratio of TKX-50 is relatively small.In formic acid/H_(2)O mixed solvents with different volume ratios(1/4,1/3,1/2,1/1 and 2/1),aspect ratio of TKX-50 is relatively small when volume ratio is 1/2.
文摘Network attached storage (NAS) with the properties of improved scalability, simplified management, low cost and balanced price performance, is desirable for high performance storage systems applied to extensive areas. Unfortunately, it also has some disadvantages such as increased network workload, and inconvenience in disaster recovery. To overcome these disadvantages, we propose a channel bonding technique and provide hot backup functions in the designed NAS system, named HUSTserver. Channel bonding means merging multiple Ethernet channels into integrated one, and that the data packets can be transferred through any available network channels in a parallel mode. The hot backup function provides automatic data mirroring among servers. In this paper, we first describe the whole system prototype from a software and hardware architecture view. Then, multiple Ethernet and hot backup technologies that distinguish HUSTserver from others are discussed in detail. The findings presented demonstrate that network bandwidth can be scaled by the use of multiple commodity networks. Dual parallel channels of commodity 100 Mbps Ethernet are both necessary and sufficient to support the data rates of multiple concurrent file transfers. And the hot backup function introduced in our system provides high data accessibility.
基金financial supports from the National Key R&D Program of China(No.2018YFC1801804)the Shandong Provincial Natural Science Foundation,China(Nos.ZR2020QD120 and ZR2018LD001)Project of Introducing and Cultivating Young Talent in the Universities of Shandong Province,China(No.QC2019YY144)。
文摘The column bioleaching of copper flotation tailings was comparatively investigated using layered heap construction method(LM),agglomerate heap construction method(AM),and pellets-sintering heap construction method(PM).The bacterial communities of free,attached,weakly-attached,and strongly-attached microbes in the later bioleaching stage were investigated.In AM group,the addition of lump sulphide ore resulted in the low leachate pH,high ferric iron concentration,and rapid microbial adsorption,which obtained the maximum copper extraction(60.1%)compared with LM(54.6%)and PM(43.9%)groups.The relative abundance of dominant genera and microbial communities of different microbiota underwent changes in three heap construction methods.The alpha-diversity indexes of attached,weakly-attached,and strongly-attached microbes were different,while no significant change was observed in free bacteria.The variation of whole bacterial community was significantly associated with solution pH,total iron,and ferric iron concentrations.Pearson correlation analysis and partial least square path model both indicated that attached bacteria made larger contribution to the copper extraction of tailings.
基金Science and Technology Project of SGCC(State Grid Corporation of China),Grant/Award Number:5700‐202212197A‐1‐1‐ZN。
文摘With the incorporation of renewable energy,load frequency control(LFC)becomes more challenging due to uncertain power generation and changeable load demands.The electric vehicle(EV)has been a popular transportation and can also provide flexible options to play a role in frequency regulation.In this paper,a novel adaptive composite controller is designed to solve the LFC problem for the interconnected power system with electric vehicles and wind turbine.EVs are used as regulation resources to effectively compensate the power mismatch.First,the sliding mode controller is developed to reduce the random influences caused by the wind turbine generation system.Second,an auxiliary controller with reinforcement learning is proposed to produce adaptive control signals,which will be attached to the primary proportion-integration-differentiation control signal in a realtime manner.Finally,by considering random wind power,load disturbances and output constraints,the proposed scheme is verified on a two-area power system under four different cases.Simulation results demonstrate that the proposed adaptive composite frequency control scheme has a competitive performance with regard to dynamic performance.
文摘General Great importance is being attached in the electric power in-dustry to the inspection of rotor shafts. This is because defects areusually concentrated at the central part of large forgings for makingrotors, some remnants of them may still remain after the centre borehas been drilled. Some rotors even have quite a number of defects atlocations rather remote from the centre bore. Working conditions for steam turbine rotors are very ex-
基金Supported by The Translational Research Programthe Strategic Promotion for Practical Applications of Innovative Medical Technology(TR-SPRINT)from the Japan Agency for Medical Research and Development(AMED)
文摘AIM To evaluate appropriate and rapid polyglycolic acid sheet(PGAs) covering time using device delivery station system(DDSS).METHODS This pilot basic study was conducted to evaluate the potential of accurate and rapid PGAs delivery using DDSS. Three 11-month-old female Beagle dogs were used in this study. Two endoscopic submucosal dissections(ESDs) 4 cm in diameter were performed in lesser curvature of middle gastric body and greater curvature of antrum(total 6 ESDs performed). DDSS(3 cm length, 12 mm in outer diameter) has 2 chambers which 16 cm^2 large 2 PGAs were stored, and DDSS was attached post ESD ulcers, respectively. Beriplast P?(CSL Behring K.K., Tokyo, Japan)(combination of fibringlue and thrombin) was applied equally to the artificial ulcer, and tight attachment of 2 PGAs with DDSS were completed. The evaluation items were covering times, post ESD bleeding and perforation during ESD.RESULTS The covering time of PGAs(defined as the duration from the beginning of endoscope insertion into the mouth to the end of the fibrin glue coating process) was 6.07(4.86-8.29) min. There was no postESD bleeding(1-7 d after ESD), and there was no perforation during ESD.CONCLUSION DDSS was very useful for rapid delivering and tight attachment of PGAs, and has potentials of multipurpose delivery station system.
基金National Natural Science Foundation of China,51675268,Xiaolei WangNatural Science Research Fund of Higher Education of Anhui Province,KJ2020A0230,Meng Li+3 种基金open project of key laboratory of green fabrication and surface technology of advanced metal materials,GFST2021KF05,Meng Liopen project of Anhui Province Key Laboratory of special and heavy load robot,TZJQR004-2021,Meng LiNatural Science Foundation of Anhui Province of China,2108085QE228,Meng LiNatural Science Foundation of Anhui Province of China,2108085ME174,Liping Shi。
文摘Salamanders have evolved functions of attaching to a variety of surfaces under wet conditions,but racial diversity may cause a difference in attachment behaviors and epidermal characteristics.The sticking and climbing abilities of the Chinese Fire Belly Newt(CFBN),Chinese Warts Triton(CWT),Spotless Stout Newt(SSN),and Chinese Giant Salamander(CGS)on various surfaces were investigated and compared in terms of epidermal morphology,body size,and wettability.The results indicate that the spotless stout newt has an excellent ability for wet attachment,compared to other salamanders under a certain contact case,resulting from its lower mass/body surface area and more visible epidermal structures.Supplementation with moderate water is beneficial for salamander attachment,and the surface roughness in the flood case also promotes the wet attachment.The CFBN has the most hydrophilic epidermis among the samples,where the water droplet quickly spreads over,presenting a completely wetting case.This study offers a comprehensive understanding of the wet attachments and the epidermal characteristics of salamanders,which is meaningful for the application of bioinspired adhesives.
基金Supported by Fund on the National Key Technology R&D Program of the Ministry of Science and Technology of China(2012BAD18B022012BAD18B01-2)+1 种基金The National Public Welfare Industry(Agriculture)Special Program(201003068)The Special Project for the Social Common Wealth Research of the National Science Research Institute(2015TS05)
文摘In order to understand the biological community characteristics of different surface treatments of ＇artificial reef templates ,which had been placed on the offshore, Yuanzhou island, Daya Bay. Sampling survey was taken in August of 2014. The results showed that 39 species of fouling organisms were collected and iden- tiffed, Ostrea nigromarginata has attached the absolute position of the dominant species ; Through the concrete block surface treatment has a better biofouling effect, and red brick, granite plates and no-surface-treated concrete template attached biomass and abundance of organisms were very low ; Biomass and abundance indices and ecological indices do not show a certain degree of regularity.
文摘Since the pioneering work by Panksepp et al,the neurobiological bases of attachment behavior have been closely linked with opioid neurotransmission.Candidate gene studies of adult individuals have shown that variation in the muopioid receptor gene(OPRM1)influences attachment behavior.Early maternal care and the A/A genotype of the A118G polymorphism interact in modulating levels of fearful attachment.Compared to their counterparts carrying the A/A genotype,individuals expressing the minor 118G allele show lower levels of avoidant attachment and experience more pleasure in social situations.Brain imaging research has strengthened the biological plausibility of candidate gene studies.The avoidance dimension of attachment correlates negatively with muopioid receptor availability in the thalamus and anterior cingulate cortex,as well as the frontal cortex,amygdala,and insula.Overall,findings from human studies combined with those from animal models suggest that research on the genetic bases of attachment should include the endogenous opioid system among the investigated variables.
文摘Security environment is both an objective reality and a subjective consciousness. Here so-called "objective reality" mainly refers to the inherent law of the changes in international security situation. To a great extent, the subjective consciousness of the objective reality depends on the position and strategic choices of a nation in the international
文摘Network storage increase capacity and scalability of storage system, data availability and enables the sharing of data among clients. When the developing network technology reduce performance gap between disk and network, however, mismatched policies and access pattern can significantly reduce network storage performance. So the strategy of data placement in system is an important factor that impacts the performance of overall system. In this paper, the two algorithms of file assignment are presented. One is Greed partition that aims at the load balance across all NADs (Network Attached Disk). The other is Sort partition that tries to minimize variance of service time in each NAD. Moreover, we also compare the performance of our two algorithms in practical environment. Our experimental results show that when the size distribution (load characters) of all assigning files is closer and larger, Sort partition provides consistently better response times than Greedy algorithm. However, when the range of all assigning files is wider, there are more small files and access rate is higher, the Greedy algorithm has superior performance in compared with the Sort partition in off-line.
文摘With development of networked storage and its applications, united storage network (USN) combined with network attached storage (NAS) and storage area network (SAN) has emerged. It has such advantages as high performance, low cost, good connectivity, etc. However the security issue has been complicated because USN responds to block I/O and file I/O requests simultaneously. In this paper, a security system module is developed to prevent many types of attacks against USN based on NAS head. The module not only uses effective authentication to prevent unauthorized access to the system data, but also checks the data integrity. Experimental results show that the security module can not only resist remote attacks and attacks from those who has physical access to the USN, but can also be seamlessly integrated into underlying file systems, with little influence on their performance.
基金Chinese 863 National Program Foundation(No.2006AA05Z216)
文摘Effects of operating conditions and device's geometrical sizes on geometrical properties of wall-attaching transonic jet between two parallel plat plates are numerically simulated. Conclusions are as follows: 1) Upriver part of the wall-attaching jet's center streamline is in good accordance with parabola; 2) When both gas inlet pressure and outlet pressure as well as their ratio are not too high ( the outlet pressure is less than 10 MPa and the pressure ratio is less than 3), the center streamlines of the wall-attaching jet with the same pressure ratio coincide with each other very well, and the deflection degree of the center streamline decreases with rise of the pressure ratio; 3) The deflection degree of the jet's center streamline decreases with either broadening of nozzle's throat or rise of wall offset; 4) With rise of the pressure ratio, attachment distance of the jet increases, but the increase rate descends; 5) The attachment distance ascends with rise of either the nozzle's throat or the wall offset.
文摘The Network Attachment Subsystem (NASS) is introduced to the Next Generation Network (NGN) architecture to enable services independent from access networks and support nomadism for fixed terminals. The NASS is responsible for managing the users attached to the access network in terms of user authentication, allocation of the IP address, and location management. In NGN R1, Telecommunications and Internet Converged Services and Protocols for Advanced Networking (TISPAN) studied the internal architecture and external interface protocols of NASS and published the relevant technical specifications. In NGN R2, TISPAN focuses on the study of mobility and nomadism as well as the ability to support various access network architectures. There still remain several issues that need further study.
