氧化亚氮/氧吸入舒适化技术在老年高血压患者心电监护拔牙中的应用

目的 :探讨氧化亚氮/氧吸入舒适化技术在老年高血压患者心电监护拔牙中的应用价值。方法 :根据纳入、排除标准,将60例年龄>65岁的老年高血压拔牙患者随机分为2组(n=30):试验组(氧化亚氮/氧吸入心电监护组)和对照组(常规心电监护组),记录T0(术前基础值)、T1(局部麻醉)、T2(手术操作)、T3(术后5 min)4个时间点的平均动脉压(MAP)和心率(HR)。采用SPSS 25.0软件包对数据进行统计学分析。结果:试验组组内MAP、HR各时间点比较均无统计学差异(P>0.05);对照组组内T0与T3时间点MAP、HR比较无统计学差异(P>0.05),其余各两两时间点MAP、HR比较均有统计学差异(P<0.05);组间比较,2组T0、T3时间点MAP、HR比较无统计学差异(P>0.05),2组T1、T2时间点MAP、HR比较,试验组显著小于对照组(P<0.05)。结论:氧化亚氮/氧吸入舒适化技术在老年高血压心电监护拔牙中能稳定患者情绪,维持患者血压、心率平稳,从而提高患者拔牙的安全性。

影响全球气候的温室物质以及我国温室气体及氧化亚氮标准气体的研究现状

介绍了影响全球气候的温室气体以及尚未完善的我国温室气体中氧化亚氮标准物质的研究现状。

氧化亚氮-氧辅助麻醉在心血管病人拔牙术中的应用

心血管病人局麻拔牙，经常发生血压（ＢＰ）升高，心率（ＨＲ）加快等应激反应，可能因此发生脑意外和心肌梗死等情况。为减少这些患者的恐惧心理和应激反应，增加手术安全性，将氧化亚氮氧（Ｎ２ＯＯ２）麻醉用于心血管病及高血压伴有紧张因素的病人，取得满意效果。资...

氧化亚氮——氧混合气体面罩吸入镇痛在人流术中的应用效果观察

人工流产作为避孕失败的补救措施,因其安全、简便,广泛用于临床.但术时孕妇紧张痛苦,同时面临迷走神经反射性人工流产综合征的威胁.我院在人流时应用氧化亚氮--氧混合气体面罩吸入镇痛取得满意效果,现在报道如下.

Cu、Co交换改性蒙脱土的制备及其对N_2O分解的催化活性

用Al交联剂对天然蒙脱土改性 ,制得Al交联 (支撑 )蒙脱土。用Cu2 + 、Co2 + 离子交换蒙脱土层间阳离子 ,制备Cu、Co交换蒙脱土 ,经高温焙烧 ,得到实验用催化剂 ,考察它们对N2 O分解的催化活性。结果表明 :用Al 土比为 10mmol g的Al交联蒙脱土作载体 ,通过优化制备条件制得的Cu交换蒙脱土 ,催化活性与CuY相近 ;而Co

中国农田N_2O排放量的估算

排放量估算是温室效应气体研究的重要内容。本文论述了影响农田Ｎ２Ｏ排放量估算准确性的因素，讨论如何提高农田Ｎ２Ｏ排放量估算的准确性，并估算了中国农田Ｎ２Ｏ排放总量。

CFB锅炉燃烧中N_2O的生成机理与减排控制

循环流化床燃烧技术作为一种新型洁净煤燃烧技术 ,具有高效脱硫和低NOx 排放的优点 ,但它燃烧释放出来的N2 O比常规煤粉炉要高出很多 ,因此如何正确合理地解决这个问题将会直接影响循环流化床锅炉在我国的发展。本文简单介绍了N2 O的生成机理 ,以及一些降低N2

五参口服液对糖尿病合并冠心病大鼠血管内皮损伤的影响

目的观察五参口服液对糖尿病合并冠心病大鼠血管内皮损伤指标NO、ET的影响。方法取健康Wistar雄性大鼠78只,随机分为正常对照组、模型对照组、格列美脲组、五参口服液大、小剂量组6组。将除正常对照组外,各组大鼠腹腔注射STZ建立糖尿病模型,造模后,给予普通饮食2周,改用高脂饲料喂养8周,复制T2DM模型。在喂养高脂饲料的同时,除正常对照组各组,分别给予生理盐水、消心痛、格列美脲、五参口服液大剂量、小剂量灌胃,末次给药后,腹腔注射垂体后叶素,造成大鼠急性心肌缺血,叠加建立糖尿病合并冠心病模型。末次造模后24 h,6组大鼠采血,分别分离血浆及血清,处死动物,取心室肌组织,制备心肌匀浆,以ELISA法测定血清及心肌组织NO值,以RIA法测定血浆ET值。结果与模型对照组组比较,五参口服液大、小剂量组,消心痛组大鼠血清及心肌组织NO值显著提高(P<0.05,P<0.01),血浆ET值显著升高(P<0.05,P<0.01)。结论五参口服液具有改善血管内皮功能,对血管内皮损伤具有一定保护作用,其作用机理可能与药物调节NO-ET系统有关。

Synthesis of Cu_2O/reduced graphene oxide composites as anode materials for lithium ion batteries

A facile way was used to synthesize Cu2O/reduced graphene oxide （rGO） composites with octahedron-like morphology in aqueous solution without any surfactant. TEM images of the obtained Cu2O/rGOs reveal that the Cu2O particles and rGO distribute hierarchically and the primary Cu2O particles are encapsulated well in the graphene nanosheets. The electrochemical performance of Cu2O/rGOs is enhanced compared with bare Cu2O when they are employed as anode materials for lithium ion batteries. The Cu2O/rGO composites maintain a reversible capacity of 348.4 mA？h/g after 50 cycles at a current density of 100 mA/g. In addition, the composites retain 305.8 mA？h/g after 60 cycles at various current densities of 50, 100, 200, 400 and 800 mA/g.

Enhancement of bio-oxidation of refractory arsenopyritic gold ore by adding pyrolusite in bioleaching system

Pyrolusite was added in the bioleaching process to enhance the bio-oxidation process. Bioleaching tests at different dosages of pyrolusite ore, pH and inoculation amounts of Acidithiobacillus ferrooxidans were studied. The results showed that the time of the bio-oxidation process was decreased obviously and the arsenic leaching rate reached 94.4% after the bioleaching. The bio-oxidation of arsenopyrite and the effective extraction of manganese from pyrolusite were achieved by the bioleaching process. After bioleaching, the leaching rate of gold from the reaction residues reached 95.8% by cyanide leaching. In the bio-oxidation process, pyrolusite increased the redox potential of the solution to accelerate the bioleaching rate. The experiment showed that there were two reaction modes in the bioleaching process.

Study on the Microorganisms Related with Nitrogen Cycle in Sediments of Hongfeng Lake

Hongfeng Lake,a key drinking-water source located in Karst areas,was selected to analyze the microorganisms associated with nitrogen cycle.Dilution plate method and most probable number method were used to determine the distribution condition of ammonifier,ammonium-oxidizing bacteria,nitrite-oxidizing bacteria and denitrifier in surface sediment in eight sites.The results showed that the amount of ammonifier,ammonium-oxidizing bacteria,nitrite-oxidizing bacteria and denitrifier in eight sites were 104-106 CFU/g,105-107 MPN/g,105-108 MPN/g and 105-109 MPN/g,respectively.The sampling site with the largest amount of denitrifier was Daposhang,and the other sampling sites had no significant difference;the sampling site of Huyudong bridge had the largest amount of ammonium-oxidizing bacteria;the amount of nitrite-oxidizing bacteria in Xinzhuang was higher than that of other sampling sites;the sampling site of Daposhang had the larger amount of denitrifier.

Synthesis of zeolite Beta containing ultra-small CoO particles for ethylbenzene oxidation

Zeolite Beta containing ultra-small CoO particles was synthesized from a one-step hydrothermal process. The synthesis route involves the pre-mixture of hydrofluoric acid with tetraethylammo- nium hydroxide （in a molar ratio of 1.3-1.5：1） before the addition of a silicon and cobalt source.Investigations by scanning electron microscopy, X-ray diffraction, UV-Vi s spectroscopy, X-ray pho-toelectron spectroscopy, H 2 -temperature-programmed reduct i on and transmi ssi on el ectron mi -croscopy confirm the presence of ultra-small CoO particles in the zeolite Beta structure. The ul-tra-small CoO particles in zeolite Beta present high stability against both oxidation and reduction atmospheres at high temperatures. The catalytic performance of the CoO-containing zeolite Beta catalysts was compared with other Co-containing zeolites by evaluating ethylbenzene oxidation reactivity. The CoO-containing zeolite Beta exhibits high ethylbenzene conversion and high selectiv-ity to acetophenone and 1-phenylethanol. The high activity of this catalyst system can be attributed to the high dispersion of the ultra-small CoO particles in the Beta structure.

Novel visible-light-responding InVO_4-Cu_2O-TiO_2 ternary nanoheterostructure: Preparation and photocatalytic characteristics

A novel visible-light-responding InVO4-Cu2O-TiO2 ternary nanoheterostructure was designed on the basis of the strategy of energy gap engineering and prepared through ordinary wet chemistry methods. The as-prepared nanoheterostructure was characterized by X-ray powder diffraction（XRD）, transmission electron microscopy（TEM）, high-resolution transmission electron microscopy（HRTEM） and diffuse reflectance ultraviolet-visible spectroscopy（UV-vis/DRS）. The TEM and HRTEM images of 10%InVO4-40%Cu2O-50%TiO2 confirm the formation of nanoheterostructures resulting from contact of the nanosized TiO2, Cu2O and InVO4 in the size of 5–20 nm in diameter. The InVO4-Cu2O-TiO2 nanoheterostructure, when compared with TiO2, Cu2O, InVO4, InVO4-TiO2 and Cu2O-TiO2, shows significant enhancement in the photocatalytic performance for the degradation of methyl orange（MO） under visible-light irradiation. With a 9 W energy-saving fluorescent lamp as the visible-light source, the MO degradation rate of 10%InVO4-40%Cu2O-50%TiO2 reaches close to 90% during 5 h, and the photocatalytic efficiency is maintained at over 90% after six cycles. This may be mainly ascribed to the matched bandgap configurations of TiO2, Cu2O and InVO4, and the formations of two p-n junctions by the p-type semiconductor Cu2O with the n-type semiconductors TiO2 and InVO4, all of which favor spatial photogenerated charge carrier separation. The X-ray photoelectron spectroscopy（XPS） characterization for the used 10%InVO4-40%Cu2O-50%TiO2 reveals that only a small shakeup satellite peak appears for Cu（II） species, implying bearable photocorrosion of Cu2O. This work could provide new insight into the design and preparation of novel visible-light-responding semiconductor composites.

Comparison of Fe^(2+) oxidation by Acidithiobacillus ferrooxidans in rotating-drum and stirred-tank reactors

Fe2＋ oxidation by Acidithiobacillus ferrooxidans（At.ferrooxidans） under different solid contents by adding inert Al2O3 powder was examined in rotating-drum and stirred-tank reactors.The results show that the bioactivity of At.ferrooxidans in the stirred-tank is higher than that in the rotating-drum in the absence of Al2O3 powder,but the biooxidation rate of Fe2＋ decreases markedly from 0.23 g/（L·h） to 0.025 g/（L·h） with increasing the content of Al2O3 powder from 0 to 50%（mass fraction） in the stirred-tank probably due to the deactivation of At.ferrooxidans resulting from the collision and friction of solid particles.The increase in Al2O3 content has a little adverse effect on the bioactivity of At.ferrooxidans in the rotating-drum due to different mixing mechanisms of the two reactors.The biooxidation rate of Fe2＋ in the rotating-drum is higher than that in the stirred-tank at the same content of Al2O3 powder,especially at high solid content.The higher bioactivity of At.ferrooxidans can be maintained for allowing high solid content in the rotating-drum reactor,but its application potential still needs to be verified further by the sulfide bioleaching for the property differences of Al2O3 powder and sulfide minerals.

Octahedral Cu_2O-modified TiO_2 nanotube arrays for efficient photocatalytic reduction of CO_2

A photocatalyst composed of TiO 2 nanotube arrays（TNTs） and octahedral Cu2 O nanoparticles was fabricated,and its performance in the photocatalytic reduction of CO2 under visible and simulated solar irradiation was studied. The average nanotube diameter and length was 100 nm and 5 μm,respectively. The different amount of octahedral Cu2 O modified TNTs were obtained by varying electrochemical deposition time. TNTs modified with an optimized amount of Cu2 O nanoparticles exhibited high efficiency in the photocatalysis,and the predominant hydrocarbon product was methane. The methane yield increased with increasing Cu2 O content of the catalyst up to a certain deposition time,and decreased with further increase in Cu2 O deposition time. Insufficient deposition time（5 min） resulted in a small amount of Cu2 O nanoparticles on the TNTs,leading to the disadvantage of harvesting light. However,excess deposition time（45 min） gave rise to entire TNT surface being most covered with Cu2 O nanoparticles with large sizes,inconvenient for the transport of photo-generated carriers. The highest methane yield under simulated solar and visible light irradiation was observed for the catalysts prepared at a Cu2 O deposition time of 15 and 30 min respectively. The morphology,crystallization,photoresponse and electrochemical properties of the catalyst were characterized to understand the mechanism of its high photocatalytic activity. The TNT structure provided abundant active sites for the adsorption of reactants,and promoted the transport of photogenerated carriers that improved charge separation. Modifying the TNTs with octahedral Cu2 O nanoparticles promoted light absorption,and prevented the hydrocarbon product from oxidation. These factors provided the Cu2O-modified TNT photocatalyst with high efficiency in the reduction of CO2,without requiring co-catalysts or sacrificial agents.

Advances in Greenhouse Gases Emission in Farmland Soils

[Objective] The aim was to overview the emission of greenhouse gases in farmland. [Method] Based on domestic and foreign references, production mechanism, discharging characters and major influential factors of CO2, CH4 and N2O in soils of farmland were overviewed. [Result] Production and discharge of CO2, CH. and N2O played an important role in circulation of carbon and nitrogen in terrestrial ecosystem and constituted a key method for carbon and nitrogen output. It is significant to conduct research on reduction of greenhouse gas and increase of absorption. [Conclusion] The research is beneficial for exploration on discharge rule and influential factors of greenhouse gases, providing theoretical references for reduction of greenhouse gases and study on climate change.

Cyanide removal for ultrafine gold cyanide residues by chemical oxidation methods

Because of the highly toxic cyanide in the gold cyanide residues,cyanide must be removed for environmental protection.The process mineralogy of residues was studied firstly,and then cyanide removal was carried out by three chemical methods.The results showed that the residue mainly contained Si,S and Fe.Pyrite was the main metallic mineral,and the iron-complex cyanides make cyanide removal difficult.The minerals in residues were in ultrafine particle size with high monomer dissociation degrees.In H_(2)O_(2)oxidation process,the self-decomposition and side reactions resulted in high consumption of H_(2)O_(2).In Na_(2)S_(2)O_(5)-air oxidation process,the time for complete process was long because of the reactions between Na_(2)S_(2)O_(5)and O_(2).Na_(2)SO_(3)oxidation method was found to be a new method for cyanide removal without air inflation device.The cyanide content was reduced to the national standard level in 90 min at pH 9.0 with optimum Na_(2)SO_(3)dose of 2.0 g/L.

2种不同舒适化技术在60例高血压患者阻生牙拔除术中的应用评价

目的:比较氧化亚氮/氧吸入镇静镇痛、右美托咪定联合氟比洛芬酯辅助镇静镇痛2种舒适化技术在高血压患者阻生牙拔除术中的效果。方法:将60例高血压阻生牙拔除术患者随机分为2组(n=30),X组(氧化亚氮/氧吸入镇静镇痛组)和Y组(右美托咪定联合氟比洛芬酯辅助镇静镇痛组)。记录T0(术前)、T1(局部麻醉)、T2(手术操作)、T3(术后5 min)4个时间点的平均动脉压(MAP)、心率(HR)、Ramsay评分、VAS评分。采用SPSS 20.0软件包对数据进行统计学分析。结果:2种舒适化技术,组间各指标比较无统计学差异(P>0.05);每组中T1、T2、T3,与T0时相比,情绪稳定、血流动力学平稳(P<0.05)。结论:2种舒适化技术在高血压患者阻生牙拔除术中均能稳定患者情绪,保持患者血流动力学平稳,安全有效。