The authors regret that the scientific names of some species mentioned in the paper were incorrectly presented.The incorrect sci-entific names,their locations in the paper,correct spellings and refer-ences,are listed ...The authors regret that the scientific names of some species mentioned in the paper were incorrectly presented.The incorrect sci-entific names,their locations in the paper,correct spellings and refer-ences,are listed below.展开更多
In this study, it is attempted to give an insight into the injection processability of three self-prepared polymers from A to Z. This work presents material analysis, injection molding simulation, design of ex- perime...In this study, it is attempted to give an insight into the injection processability of three self-prepared polymers from A to Z. This work presents material analysis, injection molding simulation, design of ex- periments alongside considering all interaction effects of controlling parameters carefully for green biodegradable polymeric systems, including polylactic acid （PLA）, polylactic acid-thermoplastic poly- urethane （PLA-TPU） and polylactic acid-thermoplastic starch （PLA-TPS）. The experiments were carried out using injection molding simulation software Autodesk Moldflov~~ in order to minimize warpage and volumetric shrinkage for each of the mentioned systems. The analysis was conducted by changing five significant processing parameters, including coolant temperature, packing time, packing pressure, mold temperature and melt temperature. Taguchi＇s [.27 （35） orthogonal array was selected as an efficient method for design of simulations in order to consider the interaction effects of the parameters and reduce spu- rious simulations. Meanwhile, artificial neural network （ANN） was also used for pattern recognition and optimization through modifying the processing conditions. The Taguchi coupled analysis of variance （ANOVA） and ANN analysis resulted in definition of optimum levels for each factor by two completely different methods. According to the results, melting temperature, coolant temperature and packing time had significant influence on the shrinkage and warpage. The ANN optimal level selection for minimiza- tion of shrinkage and/or warpage is in good agreement with ANOVA optimal level selection results. This investigation indicates that PLA-TPU compound exhibits the highest resistance to warpage and shrink- age defects compared to the other studied compounds.展开更多
Foreign-body ingestion is a relatively common presentation at emergency departments,but long metallic spoon swallowing is an infrequent occurrence.Unlike most cases of foreign-body ingestion,there have been no reporte...Foreign-body ingestion is a relatively common presentation at emergency departments,but long metallic spoon swallowing is an infrequent occurrence.Unlike most cases of foreign-body ingestion,there have been no reported cases of long foreign bodies reaching the jejunum.We report a rare case of a coffee spoon that was swallowed accidentally and passed through the pylorus and duodenal loop and reached the jejunum,with no complications.展开更多
Recycling of junks is positive for the environmental protection.Along with the proposal of three-child policy,purchase volume of milk powder surely will experience a drastic growth,and the milk powder spoon as an affi...Recycling of junks is positive for the environmental protection.Along with the proposal of three-child policy,purchase volume of milk powder surely will experience a drastic growth,and the milk powder spoon as an affiliated product will win the attention of parents.Against the background of consumption upgrading,consumers have had higher requirements on the humanization and safety design of products.Most of milk powder spoons on the market are plastic,and the disposal of waste milk powder spoon has gradually become a burden for the environment.Based on the environment-friendly and developmental concept,and also the characteristics of infant development,this paper proposed the“in-one”design,applied color and tactile designs into the milk powder design,chose food grade silicone to make the milk powder spoon not only a spoon but also a baby teether toy,so as to expand the service life and functions of the product,meet the requirements of saving energy,protecting environment and developing circular economy,which also to some extent reduces the burden on environment brought by plastics,improves the efficiency of junk recycling,and meet the individualized needs of consumers.展开更多
In the 1940s,Wang Zhenduo王振铎re-created the sinan司南(southpointing loadstone spoon)mentioned in ancient texts.However,subsequent researchers were unsuccessful in their attempts to replicate this design,resulting in...In the 1940s,Wang Zhenduo王振铎re-created the sinan司南(southpointing loadstone spoon)mentioned in ancient texts.However,subsequent researchers were unsuccessful in their attempts to replicate this design,resulting in longstanding questions over its feasibility.Loadstones with high natural remanent magnetization acquired today resemble the magnetism of those recorded in premodern Chinese documents.By simulating ancient stoneware processing techniques,a loadstone was cut and polished into a spoon shape.It was found that during the course of processing the loadstone spoon,demagnetization was negligible,while after completion,the internal magnetic field was rebalanced due to the change in shape,and the magnetic moment decreased slightly then stabilized for the long term.Experiments of this sort carried out by the author have testified to the enduring and reliable directivity of the resulting loadstone spoon.Paleo-magnetic research indicates that over the past two millennia the horizontal component of the geomagnetic field intensity in northern China underwent a clear M-shaped development.The level in the Qin and Han dynasties is approximately double that of the current day.Using a simulated ancient geomagnetic field,experiments have revealed that multiple methods,such as the“water floating method”and“hanging method,”could manifest a degree of geo-directivity.The comprehensive studies carried out demonstrate that the loadstone spoon is the most optimal among these diverse means for attaining magnetic directivity from the Pre-Qin period(before 221 BCE)to the Tang dynasty(618–907 CE)in view of the availability of loadstone,the state of the geomagnetic field,and existing knowledge and techniques。展开更多
Objective： To observe the clinical effects of the electro-spoon needle on insomnia. Methods： Forty cases of insomnia were treated with the electro-spoon needle, and monitored with polysomnography to compare the diff...Objective： To observe the clinical effects of the electro-spoon needle on insomnia. Methods： Forty cases of insomnia were treated with the electro-spoon needle, and monitored with polysomnography to compare the difference of sleep pattern before and after treatment. Results： After treatment, the S1 stage of sleep was shorter, whereas, S2, S3, and S4 stages of sleep and rapid eye movement sleep were longer than those before treatment （P〈0.05）. Meanwhile, there was a significant difference in sleep pattern before and after treatment （P〈0.05）. Conclusion： Electro-spoon needle can improve the symptoms of insomnia.展开更多
文摘The authors regret that the scientific names of some species mentioned in the paper were incorrectly presented.The incorrect sci-entific names,their locations in the paper,correct spellings and refer-ences,are listed below.
文摘In this study, it is attempted to give an insight into the injection processability of three self-prepared polymers from A to Z. This work presents material analysis, injection molding simulation, design of ex- periments alongside considering all interaction effects of controlling parameters carefully for green biodegradable polymeric systems, including polylactic acid （PLA）, polylactic acid-thermoplastic poly- urethane （PLA-TPU） and polylactic acid-thermoplastic starch （PLA-TPS）. The experiments were carried out using injection molding simulation software Autodesk Moldflov~~ in order to minimize warpage and volumetric shrinkage for each of the mentioned systems. The analysis was conducted by changing five significant processing parameters, including coolant temperature, packing time, packing pressure, mold temperature and melt temperature. Taguchi＇s [.27 （35） orthogonal array was selected as an efficient method for design of simulations in order to consider the interaction effects of the parameters and reduce spu- rious simulations. Meanwhile, artificial neural network （ANN） was also used for pattern recognition and optimization through modifying the processing conditions. The Taguchi coupled analysis of variance （ANOVA） and ANN analysis resulted in definition of optimum levels for each factor by two completely different methods. According to the results, melting temperature, coolant temperature and packing time had significant influence on the shrinkage and warpage. The ANN optimal level selection for minimiza- tion of shrinkage and/or warpage is in good agreement with ANOVA optimal level selection results. This investigation indicates that PLA-TPU compound exhibits the highest resistance to warpage and shrink- age defects compared to the other studied compounds.
文摘Foreign-body ingestion is a relatively common presentation at emergency departments,but long metallic spoon swallowing is an infrequent occurrence.Unlike most cases of foreign-body ingestion,there have been no reported cases of long foreign bodies reaching the jejunum.We report a rare case of a coffee spoon that was swallowed accidentally and passed through the pylorus and duodenal loop and reached the jejunum,with no complications.
基金Sponsored by 2022 Teaching Reform Project of Lingnan Normal University(000302201830)2022 Model Course of Lingnan Normal University(LingShiJiaoWu(2014)No.125)2023 Undergraduate Students’Innovation and entrepreneurship Planning of Lingnan Normal University(X202310579049X).
文摘Recycling of junks is positive for the environmental protection.Along with the proposal of three-child policy,purchase volume of milk powder surely will experience a drastic growth,and the milk powder spoon as an affiliated product will win the attention of parents.Against the background of consumption upgrading,consumers have had higher requirements on the humanization and safety design of products.Most of milk powder spoons on the market are plastic,and the disposal of waste milk powder spoon has gradually become a burden for the environment.Based on the environment-friendly and developmental concept,and also the characteristics of infant development,this paper proposed the“in-one”design,applied color and tactile designs into the milk powder design,chose food grade silicone to make the milk powder spoon not only a spoon but also a baby teether toy,so as to expand the service life and functions of the product,meet the requirements of saving energy,protecting environment and developing circular economy,which also to some extent reduces the burden on environment brought by plastics,improves the efficiency of junk recycling,and meet the individualized needs of consumers.
文摘In the 1940s,Wang Zhenduo王振铎re-created the sinan司南(southpointing loadstone spoon)mentioned in ancient texts.However,subsequent researchers were unsuccessful in their attempts to replicate this design,resulting in longstanding questions over its feasibility.Loadstones with high natural remanent magnetization acquired today resemble the magnetism of those recorded in premodern Chinese documents.By simulating ancient stoneware processing techniques,a loadstone was cut and polished into a spoon shape.It was found that during the course of processing the loadstone spoon,demagnetization was negligible,while after completion,the internal magnetic field was rebalanced due to the change in shape,and the magnetic moment decreased slightly then stabilized for the long term.Experiments of this sort carried out by the author have testified to the enduring and reliable directivity of the resulting loadstone spoon.Paleo-magnetic research indicates that over the past two millennia the horizontal component of the geomagnetic field intensity in northern China underwent a clear M-shaped development.The level in the Qin and Han dynasties is approximately double that of the current day.Using a simulated ancient geomagnetic field,experiments have revealed that multiple methods,such as the“water floating method”and“hanging method,”could manifest a degree of geo-directivity.The comprehensive studies carried out demonstrate that the loadstone spoon is the most optimal among these diverse means for attaining magnetic directivity from the Pre-Qin period(before 221 BCE)to the Tang dynasty(618–907 CE)in view of the availability of loadstone,the state of the geomagnetic field,and existing knowledge and techniques。
文摘Objective： To observe the clinical effects of the electro-spoon needle on insomnia. Methods： Forty cases of insomnia were treated with the electro-spoon needle, and monitored with polysomnography to compare the difference of sleep pattern before and after treatment. Results： After treatment, the S1 stage of sleep was shorter, whereas, S2, S3, and S4 stages of sleep and rapid eye movement sleep were longer than those before treatment （P〈0.05）. Meanwhile, there was a significant difference in sleep pattern before and after treatment （P〈0.05）. Conclusion： Electro-spoon needle can improve the symptoms of insomnia.
