Porous carbon spheres are prepared by direct carbonization of potassium salt of resorcinol-formaldehyde resin spheres, and are investigated as COadsorbents. It is found that the prepared carbon materials still maintai...Porous carbon spheres are prepared by direct carbonization of potassium salt of resorcinol-formaldehyde resin spheres, and are investigated as COadsorbents. It is found that the prepared carbon materials still maintain the typical spherical shapes after the activation, and have highly developed ultra-microporosity with uniform pore size, indicating that almost the activation takes place in the interior of the polymer spheres. The narrow-distributed ultra-micropores are attributed to the "in-situ homogeneous activation"effect produced by the mono-dispersed potassium ions as a form of -OK groups in the bulk of polymer spheres. The CS-1 sample prepared under a KOH/resins weight ratio of 1 shows a very high COcapture capacity of 4.83 mmol/g and good CO/Nselectivity of7-45. We believe that the presence of a welldeveloped ultra-microporosity is responsible for excellent COsorption performance at room temperature and ambient pressure.展开更多
In order to reduce the curing temperature, shorten the curing time of phenol-formaldehyde(PF) resin adhesive, and ensure the good water-solubility, NaOH and Ba(OH)_2 were used as compound catalysts. The influences of ...In order to reduce the curing temperature, shorten the curing time of phenol-formaldehyde(PF) resin adhesive, and ensure the good water-solubility, NaOH and Ba(OH)_2 were used as compound catalysts. The influences of the adding time of Ba(OH)_2, the adding amount of NaOH, Ba(OH)_2 and resorcinol on the properties of adhesives were studied. The properties of NaOH catalyzed phenol-formaldehyde(PF) adhesive, NaOH and Ba(OH)_2 compound catalyzed PF adhesive, NaOH and Ba(OH)_2 compound catalyzed phenol-resorcinol-formaldehyde(PRF) adhesive, and the prepared recombinant bamboo with three kinds of adhesives were compared. The experimental results show that NaOH and Ba(OH)_2 compound catalyst not only shortens the curing time of PF adhesive, but also guarantees the suitable water solubility of adhesive. After copolycondensation with resorcinol, the curing time of adhesive is further shortened, the water solubility is improved obviously, and the highest bonding strength is obtained. Infrared spectrum analysis shows that the reaction activity point of NaOH and Ba(OH)_2 compound catalyzed PRF adhesive will increase, so that both the curing temperature and curing enthalpy decrease.展开更多
Factors affecting the gelation of resorcinol-formaldehyde systems have been examined overvariable ranges applicable to oilfield use. Gelation of resorcinol-formaldehyde (RF) system wassensitive to pH,salinity and hard...Factors affecting the gelation of resorcinol-formaldehyde systems have been examined overvariable ranges applicable to oilfield use. Gelation of resorcinol-formaldehyde (RF) system wassensitive to pH,salinity and hardness. Generally,this gel system could be used in fresh water orlow salinity brine at pH higher than about 9. The application would require careful monitoring ofinjection fluids to avoid premature gelation or prolonged shut-in times,especially under conditionsof low salinity and high pH. Salinity and hardness compatibilities of the system were improved bysulfomethylation of resorcinol. Aqueous sulfomethylated resorcinol formaldehyde (SMRF)system could be used in brine with higher salinity and hardness and at a wider pH range of 5--10.展开更多
Tin dioxide is a useful n-type oxide semiconductor used in a variety of applications owing to its superior optical, electrical, and multifunctional properties. Here, we used a network of resorcinol-formaldehyde （RF）...Tin dioxide is a useful n-type oxide semiconductor used in a variety of applications owing to its superior optical, electrical, and multifunctional properties. Here, we used a network of resorcinol-formaldehyde （RF） gel to synthesize mesoporous tin dioxide via a sol-gel process. The effects of various synthesis parameters on the morphology and mesoporosity of the obtained product were investigated, including aging time of the RF gel, tin-to-formaldehyde molar ratio, resorcinol-to-carbonate molar ratio, and the aging time of the tin/RF mixed gel. Our experimental results showed that the interaction between the network of the RF gel and tin-containing sol is a key factor that affected the structural strength of the porous network and the porosity of the final product. Through control of the interactions in the tin/RF mixed gel we obtained porous tin dioxide materials that could be effectively used to form large-surface area films with desirable mesoporous properties.展开更多
目的探究间苯三酚对舒芬太尼复合丙泊酚在宫腔镜手术应用时对患者呼吸循环的影响。方法收集2023年1月~2023年12月于首都医科大学附属复兴医院接受宫腔镜手术治疗的136例患者的临床资料进行回顾性研究,根据患者术前是否静脉滴注间苯三酚...目的探究间苯三酚对舒芬太尼复合丙泊酚在宫腔镜手术应用时对患者呼吸循环的影响。方法收集2023年1月~2023年12月于首都医科大学附属复兴医院接受宫腔镜手术治疗的136例患者的临床资料进行回顾性研究,根据患者术前是否静脉滴注间苯三酚将其分为对照组(n=60)和观察组(n=76)。对照组采用舒芬太尼联合丙泊酚进行麻醉诱导,观察组则在对照组基础上于术前静脉滴注间苯三酚。比较两组患者不同时间呼吸循环功能[平均动脉压(MAP)、心率(HR)和呼吸频率(RR)]指标;比较两组患者麻醉效果;比较两组患者术后1 h Ramsay评分和视觉模拟评分法(VAS)评分情况;比较两组患者手术前后免疫功能及术后不良反应发生情况。结果给药前和术毕时,两组患者呼吸循环功能指标比较,差异均无统计学意义(P>0.05);手术5 min时,观察组患者的MAP、RR水平均高于对照组患者,HR低于对照组患者[(85.98±10.12)mmHg vs.(72.89±6.02)mmHg、(15.63±1.56)次∕min vs.(12.04±2.75)次∕min,(75.26±8.54)次∕min vs.(82.65±5.13)次∕min],差异均有统计学意义(t=8.856、8.856、5.911,P<0.05)。观察组患者的麻醉起效时间和术后意识恢复时间均短于对照组患者,术后1 h VAS评分低于对照组患者,而术后1 h Ramsay评分高于对照组患者[(2.08±0.29)min vs.(2.48±0.45)min、(6.16±2.08)min vs.(9.28±1.52)min、(2.48±0.72)分vs.(2.76±0.82)分、(3.12±0.92)分vs.(2.71±0.89)分],差异均有统计学意义(t=6.275、9.742、2.118、2.618,P<0.05)。术前1 d,两组患者的T淋巴细胞亚群水平比较,差异均无统计学意义(P>0.05);术后1 d,观察组患者血清中CD3^(+)、CD4^(+)水平及CD4^(+)∕CD8^(+)均高于对照组患者,而CD8^(+)水平低于对照组患者[(54.35±4.15)vs.(49.65±5.02)、(35.34±3.12)vs.(31.59±2.26)、(28.59±3.24)vs.(28.96±3.29)、(1.38±0.17)vs.(1.21±0.13)],差异均有统计学意义(5.977、7.827、6.406、0.657,P<0.05)。观察组患者术后不良反应总发生率为3.95%(3∕76),低于对照组患者的15.00%(9∕60),差异有统计学意义(χ^(2)=5.091,P<0.05)。结论宫腔镜手术患者舒芬太尼复合丙泊酚时应用间苯三酚可以改善患者呼吸循环、麻醉情况和免疫功能,并能够在一定程度上减少不良反应的发生,具有重要的临床应用价值。展开更多
基金the financial supports by the Natural Science Foundation of China (NSFC21576158, 21476132, 21576159 and 21403130)Shandong Provincial Natural Science Foundation, China (No. 2015 ZRB01765)
文摘Porous carbon spheres are prepared by direct carbonization of potassium salt of resorcinol-formaldehyde resin spheres, and are investigated as COadsorbents. It is found that the prepared carbon materials still maintain the typical spherical shapes after the activation, and have highly developed ultra-microporosity with uniform pore size, indicating that almost the activation takes place in the interior of the polymer spheres. The narrow-distributed ultra-micropores are attributed to the "in-situ homogeneous activation"effect produced by the mono-dispersed potassium ions as a form of -OK groups in the bulk of polymer spheres. The CS-1 sample prepared under a KOH/resins weight ratio of 1 shows a very high COcapture capacity of 4.83 mmol/g and good CO/Nselectivity of7-45. We believe that the presence of a welldeveloped ultra-microporosity is responsible for excellent COsorption performance at room temperature and ambient pressure.
基金Funded by the China Postdoctoral Science Foundation Funded Project(2015M572276)the Natural Science Foundation of Hunan Province,China(2016JJ3184)the Hunan Major Science and Technology Projects(2011FJ1006)
文摘In order to reduce the curing temperature, shorten the curing time of phenol-formaldehyde(PF) resin adhesive, and ensure the good water-solubility, NaOH and Ba(OH)_2 were used as compound catalysts. The influences of the adding time of Ba(OH)_2, the adding amount of NaOH, Ba(OH)_2 and resorcinol on the properties of adhesives were studied. The properties of NaOH catalyzed phenol-formaldehyde(PF) adhesive, NaOH and Ba(OH)_2 compound catalyzed PF adhesive, NaOH and Ba(OH)_2 compound catalyzed phenol-resorcinol-formaldehyde(PRF) adhesive, and the prepared recombinant bamboo with three kinds of adhesives were compared. The experimental results show that NaOH and Ba(OH)_2 compound catalyst not only shortens the curing time of PF adhesive, but also guarantees the suitable water solubility of adhesive. After copolycondensation with resorcinol, the curing time of adhesive is further shortened, the water solubility is improved obviously, and the highest bonding strength is obtained. Infrared spectrum analysis shows that the reaction activity point of NaOH and Ba(OH)_2 compound catalyzed PRF adhesive will increase, so that both the curing temperature and curing enthalpy decrease.
文摘Factors affecting the gelation of resorcinol-formaldehyde systems have been examined overvariable ranges applicable to oilfield use. Gelation of resorcinol-formaldehyde (RF) system wassensitive to pH,salinity and hardness. Generally,this gel system could be used in fresh water orlow salinity brine at pH higher than about 9. The application would require careful monitoring ofinjection fluids to avoid premature gelation or prolonged shut-in times,especially under conditionsof low salinity and high pH. Salinity and hardness compatibilities of the system were improved bysulfomethylation of resorcinol. Aqueous sulfomethylated resorcinol formaldehyde (SMRF)system could be used in brine with higher salinity and hardness and at a wider pH range of 5--10.
文摘Tin dioxide is a useful n-type oxide semiconductor used in a variety of applications owing to its superior optical, electrical, and multifunctional properties. Here, we used a network of resorcinol-formaldehyde （RF） gel to synthesize mesoporous tin dioxide via a sol-gel process. The effects of various synthesis parameters on the morphology and mesoporosity of the obtained product were investigated, including aging time of the RF gel, tin-to-formaldehyde molar ratio, resorcinol-to-carbonate molar ratio, and the aging time of the tin/RF mixed gel. Our experimental results showed that the interaction between the network of the RF gel and tin-containing sol is a key factor that affected the structural strength of the porous network and the porosity of the final product. Through control of the interactions in the tin/RF mixed gel we obtained porous tin dioxide materials that could be effectively used to form large-surface area films with desirable mesoporous properties.
文摘目的探究间苯三酚对舒芬太尼复合丙泊酚在宫腔镜手术应用时对患者呼吸循环的影响。方法收集2023年1月~2023年12月于首都医科大学附属复兴医院接受宫腔镜手术治疗的136例患者的临床资料进行回顾性研究,根据患者术前是否静脉滴注间苯三酚将其分为对照组(n=60)和观察组(n=76)。对照组采用舒芬太尼联合丙泊酚进行麻醉诱导,观察组则在对照组基础上于术前静脉滴注间苯三酚。比较两组患者不同时间呼吸循环功能[平均动脉压(MAP)、心率(HR)和呼吸频率(RR)]指标;比较两组患者麻醉效果;比较两组患者术后1 h Ramsay评分和视觉模拟评分法(VAS)评分情况;比较两组患者手术前后免疫功能及术后不良反应发生情况。结果给药前和术毕时,两组患者呼吸循环功能指标比较,差异均无统计学意义(P>0.05);手术5 min时,观察组患者的MAP、RR水平均高于对照组患者,HR低于对照组患者[(85.98±10.12)mmHg vs.(72.89±6.02)mmHg、(15.63±1.56)次∕min vs.(12.04±2.75)次∕min,(75.26±8.54)次∕min vs.(82.65±5.13)次∕min],差异均有统计学意义(t=8.856、8.856、5.911,P<0.05)。观察组患者的麻醉起效时间和术后意识恢复时间均短于对照组患者,术后1 h VAS评分低于对照组患者,而术后1 h Ramsay评分高于对照组患者[(2.08±0.29)min vs.(2.48±0.45)min、(6.16±2.08)min vs.(9.28±1.52)min、(2.48±0.72)分vs.(2.76±0.82)分、(3.12±0.92)分vs.(2.71±0.89)分],差异均有统计学意义(t=6.275、9.742、2.118、2.618,P<0.05)。术前1 d,两组患者的T淋巴细胞亚群水平比较,差异均无统计学意义(P>0.05);术后1 d,观察组患者血清中CD3^(+)、CD4^(+)水平及CD4^(+)∕CD8^(+)均高于对照组患者,而CD8^(+)水平低于对照组患者[(54.35±4.15)vs.(49.65±5.02)、(35.34±3.12)vs.(31.59±2.26)、(28.59±3.24)vs.(28.96±3.29)、(1.38±0.17)vs.(1.21±0.13)],差异均有统计学意义(5.977、7.827、6.406、0.657,P<0.05)。观察组患者术后不良反应总发生率为3.95%(3∕76),低于对照组患者的15.00%(9∕60),差异有统计学意义(χ^(2)=5.091,P<0.05)。结论宫腔镜手术患者舒芬太尼复合丙泊酚时应用间苯三酚可以改善患者呼吸循环、麻醉情况和免疫功能,并能够在一定程度上减少不良反应的发生,具有重要的临床应用价值。
