BACKGROUND Omental infarction(OI)is a surgical abdominal disease that is not common in adults and is very rare in children.Similar to various acute abdominal pain diseases including appendicitis,diagnosis was previous...BACKGROUND Omental infarction(OI)is a surgical abdominal disease that is not common in adults and is very rare in children.Similar to various acute abdominal pain diseases including appendicitis,diagnosis was previously achieved by diagnostic laparotomy but more recently,ultrasonography or computed tomography(CT)examination has been used.CASE SUMMARY A 6-year-old healthy boy with no specific medical history visited the emergency room with right lower abdominal pain.He underwent abdominal ultrasonography by a radiologist to rule out acute appendicitis.He was discharged with no significant sonographic finding and symptom relief.However,the symptoms persisted for 2 more days and an outpatient visit was made.An outpatient abdominal CT was used to make a diagnosis of OI.After laparoscopic operation,his symptoms resolved.CONCLUSION In children’s acute abdominal pain,imaging studies should be performed for appendicitis and OI.展开更多
In this study,the effects of Ca addition on the microstructure,thermal properties,and mechanical properties of a Mg-6.0Zn-1.2Y-0.7Zr(ZWK611)alloy at room temperature and 150℃ were investigated.With an increase in the...In this study,the effects of Ca addition on the microstructure,thermal properties,and mechanical properties of a Mg-6.0Zn-1.2Y-0.7Zr(ZWK611)alloy at room temperature and 150℃ were investigated.With an increase in the Ca content,the ignition resistance of the ZWK611 alloy improved and the grains became finer.The as-cast ZWK611 alloy consisted mainly of the dendriticα-Mg matrix and I-phase(Mg_(3)Zn_(6)Y)at the grain boundaries.On the other hand,theτ-(Ca_(2)Mg_(6)Zn_(3))and I-phases were formed in the Ca-added ZWK611 alloy.The fraction of theτ-phase increased with an increase in the Ca content.After the solid-solution treatment,these phases remained partially at the grain boundaries of the Ca-added ZWK611 alloys and an additional W-phase(Mg_(3)Zn_(3)Y)was observed.The phases remaining at the grain boundaries restricted the grain growth through the grain boundary pinning effect.The aging treatment resulted in the formation of MgZn'precipitates in theα-Mg matrix of the alloys.These precipitates were more uniformly distributed in the Ca-added alloys than in the alloys without Ca.Thus,the heat treatment-induced precipitation improved the tensile and creep properties of the T6-treated alloys.The T6-treated ZWK611+0.7Ca alloy exhibited the best mechanical properties at room temperature and 150℃ among all the tested alloys.展开更多
The synthesis and characterization of amphiphilic copolymers of poly（dimethyl siloxane）(PDMS),poly（ethylene oxide）(PEO), and heparin（Hep） were investigated. These multiblock copolymers wereidentified using;H-NMR...The synthesis and characterization of amphiphilic copolymers of poly（dimethyl siloxane）(PDMS),poly（ethylene oxide）(PEO), and heparin（Hep） were investigated. These multiblock copolymers wereidentified using;H-NMR, FTIR, end group analysis, and sulfur elemental analysis. The multiblockcopolymers were characterized by using DSC and X-ray diffractometry. The glass transition temperature,crystalline melting characteristics, annealing effect, and cold crystallization of the block copolymers weredetermined by DSC. The crystallinity of the block copolymers was also determined by X-ray diffractionmethod.展开更多
The aim of this study was to establish the optimum harvesting time and the content of flavonoids in the leaves, stems, and roots of Artemisia montana Pamp. A. montana was monitored from June to October in 2012. The yi...The aim of this study was to establish the optimum harvesting time and the content of flavonoids in the leaves, stems, and roots of Artemisia montana Pamp. A. montana was monitored from June to October in 2012. The yield of A. montana at high density (30 × 10 cm) was higher than that of A. montana at low density (30 × 20 and 30 cm). Yield in terms of dry weight was increased with an extended growth period and development stage. High yield achieved at 2580 and 2757 kg?10 a?1 in September and October, respectively. Among the leaves, stems, and underground plant organs, jaceosidin and eupatilin were mainly detected in the leaves, and the highest levels were observed in June, at values of 66.6 and 158.2 mg?100 g?1, respectively. In contrast, apigenin was the major compound detected in the underground plant organs, with levels ranging from 21.2 to 29.5 mg?100 g?1 until September. Therefore, optimal harvest times were between September and October, generating a high yield and adding economic value although a higher level of total flavonoids was observed in crops harvested in June.展开更多
According to deplete natural resources and need to protect the environment,the demand of a usage of waste material has significantly increased.Many studies are currently being carried out on the development of innovat...According to deplete natural resources and need to protect the environment,the demand of a usage of waste material has significantly increased.Many studies are currently being carried out on the development of innovative and environmentally friendly materials for securing the safety of road users and improving the performance and durability of roads.For example,studies are currently being conducted on the use of waste tires as a substitute for currently used fuels.Since the development of the automobile industry,the amount of waste tire has continuously increased in accordance with the increased vehicle numbers.Tire-derived fuel(TDF)has been used as a fuel source with generated TDF fly ash.Mineral filler,made of fine mineral particles of a physical size passing the number 200 standard mesh sieve(75 micron),plays an important role in asphalt mixtures properties.This paper presents an application of TDF fly ash as filler in hot mix asphalt(HMA).In this study,the performance of TDF fly ash was confirmed through a comparison with three other mineral fillers:stone dust,cement,and hydrated lime.Various tests including Marshall stability test,moisture sensitivity test,dynamic immersion test,and a wheel tracking test were performed to investigate the difference in the behaviors of the samples with different parameters considered in this study.The results show that the mechanical performance of hot mix asphalt using TDF fly ash satisfied the quality standard specification of the Ministry of Land,Infrastructure and Transport(MOLIT),Korea.It can be concluded that the use of TDF fly ash as a mineral filler in HMA not only satisfied the mechanical properties,but also reduced the volume of the pollutants waste in the environment.展开更多
文摘BACKGROUND Omental infarction(OI)is a surgical abdominal disease that is not common in adults and is very rare in children.Similar to various acute abdominal pain diseases including appendicitis,diagnosis was previously achieved by diagnostic laparotomy but more recently,ultrasonography or computed tomography(CT)examination has been used.CASE SUMMARY A 6-year-old healthy boy with no specific medical history visited the emergency room with right lower abdominal pain.He underwent abdominal ultrasonography by a radiologist to rule out acute appendicitis.He was discharged with no significant sonographic finding and symptom relief.However,the symptoms persisted for 2 more days and an outpatient visit was made.An outpatient abdominal CT was used to make a diagnosis of OI.After laparoscopic operation,his symptoms resolved.CONCLUSION In children’s acute abdominal pain,imaging studies should be performed for appendicitis and OI.
基金the support of the Korea Institute of Industrial Technology as"Enterprise demand-based production technology commercialization project(KITECH JG-20–0003)"。
文摘In this study,the effects of Ca addition on the microstructure,thermal properties,and mechanical properties of a Mg-6.0Zn-1.2Y-0.7Zr(ZWK611)alloy at room temperature and 150℃ were investigated.With an increase in the Ca content,the ignition resistance of the ZWK611 alloy improved and the grains became finer.The as-cast ZWK611 alloy consisted mainly of the dendriticα-Mg matrix and I-phase(Mg_(3)Zn_(6)Y)at the grain boundaries.On the other hand,theτ-(Ca_(2)Mg_(6)Zn_(3))and I-phases were formed in the Ca-added ZWK611 alloy.The fraction of theτ-phase increased with an increase in the Ca content.After the solid-solution treatment,these phases remained partially at the grain boundaries of the Ca-added ZWK611 alloys and an additional W-phase(Mg_(3)Zn_(3)Y)was observed.The phases remaining at the grain boundaries restricted the grain growth through the grain boundary pinning effect.The aging treatment resulted in the formation of MgZn'precipitates in theα-Mg matrix of the alloys.These precipitates were more uniformly distributed in the Ca-added alloys than in the alloys without Ca.Thus,the heat treatment-induced precipitation improved the tensile and creep properties of the T6-treated alloys.The T6-treated ZWK611+0.7Ca alloy exhibited the best mechanical properties at room temperature and 150℃ among all the tested alloys.
文摘The synthesis and characterization of amphiphilic copolymers of poly（dimethyl siloxane）(PDMS),poly（ethylene oxide）(PEO), and heparin（Hep） were investigated. These multiblock copolymers wereidentified using;H-NMR, FTIR, end group analysis, and sulfur elemental analysis. The multiblockcopolymers were characterized by using DSC and X-ray diffractometry. The glass transition temperature,crystalline melting characteristics, annealing effect, and cold crystallization of the block copolymers weredetermined by DSC. The crystallinity of the block copolymers was also determined by X-ray diffractionmethod.
文摘The aim of this study was to establish the optimum harvesting time and the content of flavonoids in the leaves, stems, and roots of Artemisia montana Pamp. A. montana was monitored from June to October in 2012. The yield of A. montana at high density (30 × 10 cm) was higher than that of A. montana at low density (30 × 20 and 30 cm). Yield in terms of dry weight was increased with an extended growth period and development stage. High yield achieved at 2580 and 2757 kg?10 a?1 in September and October, respectively. Among the leaves, stems, and underground plant organs, jaceosidin and eupatilin were mainly detected in the leaves, and the highest levels were observed in June, at values of 66.6 and 158.2 mg?100 g?1, respectively. In contrast, apigenin was the major compound detected in the underground plant organs, with levels ranging from 21.2 to 29.5 mg?100 g?1 until September. Therefore, optimal harvest times were between September and October, generating a high yield and adding economic value although a higher level of total flavonoids was observed in crops harvested in June.
基金conducted under a research project (Development of Eco-Friendly Pavements to Minimize Greenhouse Gas Emissions) funded by the Ministry of Land,Infrastructure and Transport and the Korea Agency for Infrastructure Technology Advancement (KAIA).
文摘According to deplete natural resources and need to protect the environment,the demand of a usage of waste material has significantly increased.Many studies are currently being carried out on the development of innovative and environmentally friendly materials for securing the safety of road users and improving the performance and durability of roads.For example,studies are currently being conducted on the use of waste tires as a substitute for currently used fuels.Since the development of the automobile industry,the amount of waste tire has continuously increased in accordance with the increased vehicle numbers.Tire-derived fuel(TDF)has been used as a fuel source with generated TDF fly ash.Mineral filler,made of fine mineral particles of a physical size passing the number 200 standard mesh sieve(75 micron),plays an important role in asphalt mixtures properties.This paper presents an application of TDF fly ash as filler in hot mix asphalt(HMA).In this study,the performance of TDF fly ash was confirmed through a comparison with three other mineral fillers:stone dust,cement,and hydrated lime.Various tests including Marshall stability test,moisture sensitivity test,dynamic immersion test,and a wheel tracking test were performed to investigate the difference in the behaviors of the samples with different parameters considered in this study.The results show that the mechanical performance of hot mix asphalt using TDF fly ash satisfied the quality standard specification of the Ministry of Land,Infrastructure and Transport(MOLIT),Korea.It can be concluded that the use of TDF fly ash as a mineral filler in HMA not only satisfied the mechanical properties,but also reduced the volume of the pollutants waste in the environment.
