Carbide slag was used as an activator to improve the activity of anhydrous phosphogypsum.Carbide slag could greatly improve the mechanical strength of anhydrous phosphogypsum than K_(2)SO_(4).The compressive strength ...Carbide slag was used as an activator to improve the activity of anhydrous phosphogypsum.Carbide slag could greatly improve the mechanical strength of anhydrous phosphogypsum than K_(2)SO_(4).The compressive strength of 11 wt%carbide slag and 1 wt%K_(2)SO_(4)activated anhydrous phosphogypsum increased greatly to 8.6 MPa at 3 d,and 11.9 MPa at 7 d,and 16.0 MPa at 28 d,respectively.The rate of hydration heat was accelerated and the total hydration heat was increased,and more calcium sulfate dihydrate was formed and cross-linked with other parts which improved the compressive strength of anhydrous phosphogypsum under the effects of different activators.It was indicated that carbide slag was a highly effective and cost-efficient activator.The result provides a highly effective and low-cost method which results in a novel and high value-added method for the utilization of phosphogypsum in the future.展开更多
The phosphorus slag（PS） can be used as a supplementary cementitious material due to its potential hydrating activity. However, its usage has been limited by its adverse effects, including prolonged setting and lower...The phosphorus slag（PS） can be used as a supplementary cementitious material due to its potential hydrating activity. However, its usage has been limited by its adverse effects, including prolonged setting and lowered early-stage strength. In this study, we achieved ultrafine granulation of PS using wetmilling（reducing d50 to as low as 2.02 μm） in order to increase its activity, and examined the physico-chemical properties of the resulting materials, including particle-size distribution, slurry pH, zeta potential, and activity index, as well as how their replacement level and granularity affect the setting time and mechanical performance of PS-cement mixture systems. The results suggested that as the granularity increases, there are significant boosts in the uniformity of particle sizes, slurry pH, and activity index, and the effects on cement paste, including setting times, and early-and late-stage strengths, are significantly mitigated. When d（50）=2.02 μm, the slurry becomes strongly alkaline（pH=12.16） compared to the initial d（50）=20.75 μm（pH=9.49）, and the activity is increased by 73%; when used at 40% replacement, the PS-cement mixture system can reach a 28 d compressive strength of 93.2 MPa, 36% higher than that of the pure cement control group.展开更多
Thaumasite form of sulfate attack（TSA） can be observed in cement containing limestone under sulfate condition at low temperature. Mixing with suitable mineral admixture could be a good choice to improve the TSA resi...Thaumasite form of sulfate attack（TSA） can be observed in cement containing limestone under sulfate condition at low temperature. Mixing with suitable mineral admixture could be a good choice to improve the TSA resistance performance of cement-based materials. We investigated the durability performance of limestone-cement mortars reinforced with silica fume（SF） in 5% MgSO_4 solution at 5 ℃. The mortars, which were immersed in aggressive condition, were prepared with 2%, 4%, 6%, 8%, and 10% cement replacement by SF at a fixed water-to-binder ratio. Appearance, compressive strength, change of length and mass and corrosion products were investigated to evaluate the TSA resistance performance of SF based specimens. The results showed that specimens in the absence of SF almost disintegrated. Increasing SF dosage can reduce the degree of deterioration of SF mortars in TSA environment. Mortar mixtures with more than 6% SF merely show slight degeneration in relation to macroscopic and microscopic tests and characterizations.展开更多
目的:探讨喉切除病人术后早期最佳的气道湿化频次。方法:选取2020年2月—2022年2月山东省某三级甲等医院耳鼻喉科108例行喉切除术并气管切开的喉癌病人作为研究对象,采用随机数字表法分为3组,每组36例,分别采取每小时1次(A组)、每隔2 h ...目的:探讨喉切除病人术后早期最佳的气道湿化频次。方法:选取2020年2月—2022年2月山东省某三级甲等医院耳鼻喉科108例行喉切除术并气管切开的喉癌病人作为研究对象,采用随机数字表法分为3组,每组36例,分别采取每小时1次(A组)、每隔2 h 1次(B组)、每隔3 h 1次(C组)3种频次氧驱雾化吸入进行气道湿化。比较3组病人的气道湿化效果、气道并发症、日吸痰次数及舒适度。结果:喉切除术后前4 d B组的湿化满意度高于A、C两组(P<0.05),术后5~7 d 3组湿化满意度差异无统计学意义(P>0.05);B组刺激性咳嗽的发生率低于A、C两组(P<0.05),其他气道并发症发生率3组比较差异无统计学意义(P>0.05);A组日吸痰次数多于B、C两组(P<0.05);B组的舒适度评分明显高于A、C两组(P<0.05)。结论:每隔2 h 1次氧驱雾化吸入能有效提高喉切除病人术后早期气道湿化满意度,降低刺激性咳嗽的发生率,提高病人舒适度,是喉切除术后较为理想的雾化频次。展开更多
ARE Chinese moms as strict as Amy Chua describes in her new book Battle Hymn of the Tiger Mother? I think some people misunderstand the Chinese parenting style,just like some Chinese misunderstand the Western parentin...ARE Chinese moms as strict as Amy Chua describes in her new book Battle Hymn of the Tiger Mother? I think some people misunderstand the Chinese parenting style,just like some Chinese misunderstand the Western parenting model. Both approaches emphasize one aspect,and so they each reach a certain extreme.In my opinion, the Chinese parenting style is not just about strictness or rigidity,nor is Western parenting just about freedom,which may ultimately lead to indulgence.展开更多
阿尔茨海默病(Alzheimer's disease,AD)作为导致痴呆的主要原因之一,其早期诊断对于及时干预和减缓疾病进展至关重要。2018年美国国家衰老研究院-阿尔茨海默协会(National Institute of Aging and Alzheimer's Association,NIA-...阿尔茨海默病(Alzheimer's disease,AD)作为导致痴呆的主要原因之一,其早期诊断对于及时干预和减缓疾病进展至关重要。2018年美国国家衰老研究院-阿尔茨海默协会(National Institute of Aging and Alzheimer's Association,NIA-AA)提出了AD的ATN(amyloid/tau/neurodegeneration)诊断标准,获得了临床普遍认可并广泛使用。本文综述了正电子发射断层显像(positron emission tomography,PET)、磁共振成像(magnetic resonance imaging,MRI)以及正电子发射型磁共振成像系统(positron emission tomography-magnetic resonance imaging,PET/MR)在ATN诊断框架下的应用,并探讨多探针多模态PET/MR在AD诊断中的显著优势。以期为学者提供研究和参考的新思路,推动AD患者的PET/MR临床应用,为临床实践提供重要的影像依据。展开更多
目的观察iRoot BP Plus作为盖髓剂,用于小型猪乳前磨牙牙髓切断术后牙髓的组织学变化,探讨i Root BP Plus广泛应用于临床的可行性。方法选用4只5月龄小型猪,选取双侧上下颌乳前磨牙共32颗,行牙髓切断术。随机选择一侧乳前磨牙为实验组,...目的观察iRoot BP Plus作为盖髓剂,用于小型猪乳前磨牙牙髓切断术后牙髓的组织学变化,探讨i Root BP Plus广泛应用于临床的可行性。方法选用4只5月龄小型猪,选取双侧上下颌乳前磨牙共32颗,行牙髓切断术。随机选择一侧乳前磨牙为实验组,采用iRoot BP Plus作为盖髓剂,另一侧为对照组,采用MTA作为盖髓剂,分别于术后2、4、8、12周处死动物。切取含实验牙的上下颌骨块,进行标本固定和HE染色,观察术后牙髓组织病理学变化。结果i Root BP Plus和MTA均可促进修复性牙本质形成,iRoot BP Plus盖髓后形成修复性牙本质较MTA早,术后8周可见牙本质桥形成,术后12周的牙本质桥形态较规则。二者均未引起浅表牙髓组织坏死,牙本质桥下方的牙髓组织表面在术后4周可见慢性炎症,术后8周炎症基本消失。结论在小型猪乳牙牙髓切断术中,使用iRoot BP Plus盖髓后12周可以形成与MTA盖髓相似的、形态较好的牙本质桥,且牙髓状态良好,为MTA临床良好替代的盖髓剂。展开更多
基金Funded by Innovation Group Fund Project of Hubei Province(No.2020CFA039)the Key Research and Development Program of Hubei Province(No.2020BCA077)。
文摘Carbide slag was used as an activator to improve the activity of anhydrous phosphogypsum.Carbide slag could greatly improve the mechanical strength of anhydrous phosphogypsum than K_(2)SO_(4).The compressive strength of 11 wt%carbide slag and 1 wt%K_(2)SO_(4)activated anhydrous phosphogypsum increased greatly to 8.6 MPa at 3 d,and 11.9 MPa at 7 d,and 16.0 MPa at 28 d,respectively.The rate of hydration heat was accelerated and the total hydration heat was increased,and more calcium sulfate dihydrate was formed and cross-linked with other parts which improved the compressive strength of anhydrous phosphogypsum under the effects of different activators.It was indicated that carbide slag was a highly effective and cost-efficient activator.The result provides a highly effective and low-cost method which results in a novel and high value-added method for the utilization of phosphogypsum in the future.
基金Funded by National Natural Science Foundation of China(No.51372076)the Technology Innovation Major Project of Hubei Province(No.2017ACA178)the Science and Technology Support Program of Hubei Province(No.2015BCA244)
文摘The phosphorus slag（PS） can be used as a supplementary cementitious material due to its potential hydrating activity. However, its usage has been limited by its adverse effects, including prolonged setting and lowered early-stage strength. In this study, we achieved ultrafine granulation of PS using wetmilling（reducing d50 to as low as 2.02 μm） in order to increase its activity, and examined the physico-chemical properties of the resulting materials, including particle-size distribution, slurry pH, zeta potential, and activity index, as well as how their replacement level and granularity affect the setting time and mechanical performance of PS-cement mixture systems. The results suggested that as the granularity increases, there are significant boosts in the uniformity of particle sizes, slurry pH, and activity index, and the effects on cement paste, including setting times, and early-and late-stage strengths, are significantly mitigated. When d（50）=2.02 μm, the slurry becomes strongly alkaline（pH=12.16） compared to the initial d（50）=20.75 μm（pH=9.49）, and the activity is increased by 73%; when used at 40% replacement, the PS-cement mixture system can reach a 28 d compressive strength of 93.2 MPa, 36% higher than that of the pure cement control group.
基金Funded by Hubei Provincial Natural Science Foundation of China(No.2016CFB353)the Science and Technology Support Program of Hubei Province(No.2015BCA244)National Natural Science Foundation of China(No.51372076)
文摘Thaumasite form of sulfate attack（TSA） can be observed in cement containing limestone under sulfate condition at low temperature. Mixing with suitable mineral admixture could be a good choice to improve the TSA resistance performance of cement-based materials. We investigated the durability performance of limestone-cement mortars reinforced with silica fume（SF） in 5% MgSO_4 solution at 5 ℃. The mortars, which were immersed in aggressive condition, were prepared with 2%, 4%, 6%, 8%, and 10% cement replacement by SF at a fixed water-to-binder ratio. Appearance, compressive strength, change of length and mass and corrosion products were investigated to evaluate the TSA resistance performance of SF based specimens. The results showed that specimens in the absence of SF almost disintegrated. Increasing SF dosage can reduce the degree of deterioration of SF mortars in TSA environment. Mortar mixtures with more than 6% SF merely show slight degeneration in relation to macroscopic and microscopic tests and characterizations.
文摘目的:探讨喉切除病人术后早期最佳的气道湿化频次。方法:选取2020年2月—2022年2月山东省某三级甲等医院耳鼻喉科108例行喉切除术并气管切开的喉癌病人作为研究对象,采用随机数字表法分为3组,每组36例,分别采取每小时1次(A组)、每隔2 h 1次(B组)、每隔3 h 1次(C组)3种频次氧驱雾化吸入进行气道湿化。比较3组病人的气道湿化效果、气道并发症、日吸痰次数及舒适度。结果:喉切除术后前4 d B组的湿化满意度高于A、C两组(P<0.05),术后5~7 d 3组湿化满意度差异无统计学意义(P>0.05);B组刺激性咳嗽的发生率低于A、C两组(P<0.05),其他气道并发症发生率3组比较差异无统计学意义(P>0.05);A组日吸痰次数多于B、C两组(P<0.05);B组的舒适度评分明显高于A、C两组(P<0.05)。结论:每隔2 h 1次氧驱雾化吸入能有效提高喉切除病人术后早期气道湿化满意度,降低刺激性咳嗽的发生率,提高病人舒适度,是喉切除术后较为理想的雾化频次。
文摘ARE Chinese moms as strict as Amy Chua describes in her new book Battle Hymn of the Tiger Mother? I think some people misunderstand the Chinese parenting style,just like some Chinese misunderstand the Western parenting model. Both approaches emphasize one aspect,and so they each reach a certain extreme.In my opinion, the Chinese parenting style is not just about strictness or rigidity,nor is Western parenting just about freedom,which may ultimately lead to indulgence.
文摘目的观察iRoot BP Plus作为盖髓剂,用于小型猪乳前磨牙牙髓切断术后牙髓的组织学变化,探讨i Root BP Plus广泛应用于临床的可行性。方法选用4只5月龄小型猪,选取双侧上下颌乳前磨牙共32颗,行牙髓切断术。随机选择一侧乳前磨牙为实验组,采用iRoot BP Plus作为盖髓剂,另一侧为对照组,采用MTA作为盖髓剂,分别于术后2、4、8、12周处死动物。切取含实验牙的上下颌骨块,进行标本固定和HE染色,观察术后牙髓组织病理学变化。结果i Root BP Plus和MTA均可促进修复性牙本质形成,iRoot BP Plus盖髓后形成修复性牙本质较MTA早,术后8周可见牙本质桥形成,术后12周的牙本质桥形态较规则。二者均未引起浅表牙髓组织坏死,牙本质桥下方的牙髓组织表面在术后4周可见慢性炎症,术后8周炎症基本消失。结论在小型猪乳牙牙髓切断术中,使用iRoot BP Plus盖髓后12周可以形成与MTA盖髓相似的、形态较好的牙本质桥,且牙髓状态良好,为MTA临床良好替代的盖髓剂。
