Photoluminescence properties of LaF_3:Eu^(3+) nanoparticles prepared by refluxing method

The europium-doped LaF3 nanoparticles were prepared by refluxing method in glycerol/water mixture and characterized with X-ray diffraction（XRD）, field emission scanning electron microscopy（FE-SEM）, UV-vis diffuse reflectance spectrum, and photoluminescence spectra.The results of XRD indicated that the obtained LaF3：Eu^3＋ nanoparticles were well crystallized with a hexagonal structure.The FE-SEM image illustrated that the LaF3：Eu^3＋ nanoparticles were spherical with an average size around 30 nm.Under irradiation of UV light, the emission spectrum of LaF3：Eu^3＋ nanoparticles exhibited the characteristic line emissions arising from the 5D0→7FJ（J=1, 2, 3, 4） transitions of the Eu3＋ ions, with the dominating emission centered at 590 nm.In addition, the emissions from the 5D1 level could be clearly observed due to the low phonon energies（-350 cm^-1） of LaF3 matrix.The optimum doping concentration for LaF3：Eu3＋ nanoparticles was determined to be 20mol.%.

Synthesis of KNiF_3 with Lower Oxygen Content by Refluxing Method

The complex fluoride, KNiF3, with perovskite structure was synthesized by refluxing KF and Ni（NO3）2·6H20 in ethanediol. The samples were characterized by X-ray diffraction（XRD）, transmission electron microscopy（TEM）, X-ray photoelectron spectroscopy（XPS）, and ultraviolet-visible diffuse reflectance speetroseopy（UV-Vis DRS）. The results indicate that the mean diameter of KNiF3 particles is about 30-60 nm and the oxygen content in the samples is ≤5%. The prepared KNiF3 shows obvious absorption peaks at 400-830 nm.

Low-temperature Denitration Mechanism of NH_(3)-SCR over Fe/AC Catalyst

To study the modification mechanism of activated carbon(AC)by Fe and the low-temperature NH_(3)-selective catalytic reduction(SCR)denitration mechanism of Fe/AC catalysts,Fe/AC catalysts were prepared using coconut shell AC activated by nitric acid as the support and iron oxide as the active component.The crystal structure,surface morphology,pore structure,functional groups and valence states of the active components of Fe/AC catalysts were characterised by X-ray diffraction,scanning electron microscopy,nitrogen adsorption and desorption,Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy,respectively.The effect of Fe loading and calcination temperature on the low-temperature denitration of NH_(3)-SCR over Fe/AC catalysts was studied using NH_(3)as the reducing gas at low temperature(150℃).The results show that the iron oxide on the Fe/AC catalyst is spherical and uniformly dispersed on the surface of AC,thereby improving the crystallisation performance and increasing the number of active sites and specific surface area on AC in contact with the reaction gas.Hence,a rapid NH_(3)-SCR reaction was realised.When the roasting temperature remains constant,the iron oxide crystals formed by increasing the amount of loading can enter the AC pore structure and accumulate to form more micropores.When the roasting temperature is raised from 400 to 500℃,the iron oxide is mainly transformed fromα-Fe_(2)O_(3)toγ-Fe_(2)O_(3),which improves the iron oxide dispersion and increases its denitration active site,allowing gas adsorption.When the Fe loading amount is 10%,and the roasting temperature is 500℃,the NO removal rate of the Fe/AC catalyst can reach 95%.According to the study,the low-temperature NH_(3)-SCR mechanism of Fe/AC catalyst is proposed,in which the redox reaction between Fe~(2+)and Fe~(3+)will facilitate the formation of reactive oxygen vacancies,which increases the amount of oxygen adsorption on the surface,especially the increase in surface acid sites,and promotes and adsorbs more reaction gases(NH_(3),O_(2),NO).The transformation from the standard SCR reaction to the fast SCR reaction is accelerated.

Remove of Phenolic Compounds in Water by Low-Temperature Plasma: A Review of Current Research

Phenolic compounds have very strong toxicity, so it has been paid sharply attention to find an effective way of controlling the wastewater containing phenolic compounds. The work on this subject done by domestic and overseas scholars is studied in this paper, and the progress of researches on low-temperature plasma treatment is summarized through the electrical discharge types, mechanism, kinetics of phenolic compounds decomposition and combination of several methods with low-temperature plasma treatment. In addition, the crucial problem and the developing tendency on low-temperature plasma treatment for phenol-bearing wastewater are briefly discussed.

Research progress and development direction of low-temperature drilling fluid for Antarctic region

By combing the characteristics of drilling in Antarctic region, performance requirements on drilling fluid for Antarctic low temperature conditions, and research progress of low temperature drilling fluid, current problems of the drilling fluid have been sorted out, and the development direction of the drilling fluid has been pointed out. Drilling in the Antarctic region mainly includes drilling in snow, ice and subglacial rock formations, and drilling in Antarctic low temperature conditions will face problems in four aspects:(1) low temperature and large temperature changes in the drilling area;(2) likely well leakage and drillstring-sticking in the snow layer, creep in the ice layer, ice chip gathering jamming in the warm ice layer, well wall collapse in the subglacial rock formations;(3) lack of infrastructure and difficulty in logistical support;(4) fragile environment and low carrying capacity. After years of development, progresses have been made on low-temperature drilling fluids for the Antarctic region. Low-temperature petroleum-based drilling fluid, ethanol/ethylene glycol-based drilling fluid, ester-based drilling fluid and silicone oil-based drilling fluid have been developed. However, these drilling fluids have problems such as insufficient low-temperature tolerance, low environmental performance and weak wellbore stability, etc. In order to meet the performance requirements of drilling fluid under low-temperature conditions in Antarctic region, the working mechanisms of low-temperature drilling fluid must be examined in depth;environment-friendly low-temperature base fluid of drilling fluid and related additives must be developed to prepare environmentally friendly low temperature drilling fluid systems;multi-functional integrated adjustment method for drilling fluid must be worked out to ensure well wall stability and improve cutting-carry capacity when drilling ice formations and ice-rock interlayers;and on-site support operation codes must be established to provide technical support for Antarctic drilling.

Effects of Ethanol Condensation Reflux Extraction and Ultrasound-assisted Extraction on the Content of Total Flavonoids of Pueraria edulis

With Pueraria edulis from different habitats in Yunnan Province,Guangdong Province and Guangxi Zhuang autonomous region as materials,the medicinal materials of P.edulis were extracted by ethanol condensation reflux extraction and ultrasound-assisted extraction,and the effects of different extraction methods the contents of total flavonoids in P.edulis from different areas were compared.The results showed that the best extraction time for P.edulis in Yunnan Province was 20 min,and that for Guangdong and Guangxi Zhuang Autonomous Region was 30 min.The yield of total flavonoids from P.edulis extracted by the condensation reflux extraction method was relatively better.The content of total flavonoids in P.edulis in Yunnan was the highest with an average content of 0.2557%,while the average content of total flavonoids in P.edulis in Guangdong was the lowest with an average content of 0.2108%.

调肝理脾法治疗肝胃郁热型难治性胃食管反流的临床研究

目的观察调肝理脾法治疗肝胃郁热型难治性胃食管反流病的临床疗效。方法选取2022年3月-2023年9月首都医科大学附属北京中医医院收治的肝胃郁热型难治性胃食管反流病患者共60例,随机分为2组,各30例。对照组给予奥美拉唑肠溶胶囊+调肝理脾方中药颗粒模拟剂治疗,治疗组给予调肝理脾方中药颗粒+奥美拉唑肠溶胶囊。比较治疗前后食管黏膜炎症改善情况、健康状况调查简表(SF-36)和胃食管反流病量表(GERD-Q)、症状及证候的疗效评价、复发率以及不良反应发生率。结果治疗后,治疗组胃镜下食管黏膜炎症改善有效率为93.33%,高于对照组(73.33%)(P<0.05);2组治疗后的SF-36评分显著升高,GERD-Q评分在治疗后显著降低,且治疗组SF-36评分高于对照组,GERD-Q评分低于对照组(P均<0.05);治疗后,治疗组中医证候评分显著低于对照组,治疗组的中医症候治疗率为96.67%,高于对照组80.00%(P均<0.05);治疗后,治疗组临床疗效为93.33%高于对照组73.33%(P<0.05);随访6个月后,治疗组未服药人数显著多于对照组(P<0.05);2组不良反应发生率无显著差异(P>0.05)。结论调肝理脾法可显著改善肝胃郁热型难治性胃食管反流病患者食管黏膜炎症、提高生活质量,改善中医证候及临床症状、复发性低,具有较好的临床治疗效果。

“和法”与针刺联合西药治疗合并焦虑抑郁的肝胃不和型胃食管反流病临床观察

目的:观察“和法”与针刺联合西药治疗合并焦虑抑郁的肝胃不和型胃食管反流病的临床疗效。方法:将符合纳入标准的93例患者随机分为3组,每组31例。西药组给予奥美拉唑肠溶胶囊、多潘立酮片、氟哌噻吨美利曲辛片口服治疗,中西药组在西药的基础上加“和法”汤剂口服治疗,中西药+针刺组在中西药的基础上加针刺治疗,3组患者疗程均为8周。观察3组患者的临床疗效,比较3组患者治疗前后中医症状积分、胃镜下黏膜积分、焦虑自评量表(SAS)积分以及抑郁自评量表(SDS)积分。结果:3组患者治疗前中医症状积分、胃镜下黏膜积分、SAS积分、SDS积分比较差异无统计学意义(P>0.05),3组患者治疗后中医症状积分、胃镜下黏膜积分、SAS积分、SDS积分均有所下降,3组患者积分比较差异有统计学意义(P<0.05),中西药+针刺组患者积分明显低于其他2组患者。西药组患者总有效率为71.0%,中西药组患者总有效率为80.6%,中西药+针刺组患者总有效率为93.5%,3组患者临床疗效比较差异有统计学意义(P<0.05)。结论:“和法”与针刺联合西药治疗合并焦虑抑郁的肝胃不和型胃食管反流病疗效确切,可有效改善患者胃镜下黏膜糜烂面,提高患者生活质量,促进身心健康。

水回流法提取煤基碳点及其荧光性能应用研究

通过水回流法从3种煤中提取出了煤基碳点,对水溶剂回流时间与用量进行了工艺优化,所制备碳点具有蓝色荧光特征,通过红外表征确认了煤基碳点表面具有O—H、C O、C—H等官能团,通过时间分辨荧光光谱计算出煤基碳点的荧光寿命为2.2μs。同时探究了3种煤基碳点在离子检测中的实际应用,它们作为荧光探针在与Fe^(3+)或Cu ^(2+)结合时会发生荧光淬灭,并且反应迅速,其中CCD-W1对Fe^(3+)和Cu^(2+)的检出限最低,检出限分别为0.16μmol/L和0.10μmol/L。

基于玄府学说探析胆汁反流性胃炎

胆汁反流性胃炎临床易反复发作、难以治愈,与多种致病因素相关,中医药在缓解其临床症状等方面具有一定优势。“玄府”起源于《黄帝内经》,其学说经刘完素等多位医家的研究总结逐渐完善,脏腑玄府理论与脾胃疾病密切相关,若机体玄府郁闭,则气液宣通失调,百病由生。本文主要从脾玄府、肝玄府、脑玄府三方面论述玄府学说与胆汁反流性胃炎病机的相关性,提出疏肝健脾、醒脑开玄的治则,为临床治疗胆汁反流性胃炎提供思路。

芪七连胶囊两种不同制备工艺对剂型成型的影响及药效评价研究

目的:改进芪七连胶囊的提取工艺和制备工艺,并进行药效学评价。方法:以粒度分布、休止角、吸湿率、胶囊的装量差异为评价指标,对比两种制备工艺(乙醇回流提取法和水煎法)对芪七连胶囊成型的影响,并以自发性高血压大鼠(SHR)为模型,对所得的芪七连胶囊成品的降压和血管内皮保护作用进行评价。结果:分别以10倍量、8倍量的50%乙醇回流提取方中黄芪、黄连、黄柏、蒲黄、杜仲、钩藤药材2次,第1次2 h,第2次1 h,减压干燥后加入三七细粉,制粒后填充胶囊。其粒度分布、休止角、吸湿率、胶囊的装量差异均优于原工艺(水煎法)。药效学实验表明,新工艺所制芪七连胶囊成品,给与临床使用量,可明显降低SHR大鼠的血压,且具有保护血管内皮细胞作用,其药效优于原工艺成品(P<0.05或P<0.01)。结论:新工艺的制备工艺可行、稳定,所制得成品具有明显的降压及保护血管内皮的作用。

中医“和法”治疗胃癌术后反流性食管炎的疗效

目的探讨中医“和法”联合针刺治疗胃癌术后反流性食管炎的疗效及对血清miR-223、miR-181a的影响。方法选取2019年3月-2022年8月于我院行胃癌手术后出现反流性食管炎的患者86例为研究对象,按照随机数字表法分为对照组和观察组,各43例。对照组采用奥美拉唑肠溶胶囊和多潘立酮片,观察组在对照组基础上,采用柴胡加龙骨牡蛎汤加减联合针刺治疗。比较2组患者临床疗效、中医症状积分、胃肠激素、炎症因子、miR-223、miR-181a等指标。采用Pearson相关分析miR-223、miR-181a与炎症因子的关系,采用多因素Logistic回归和ROC曲线分析miR-223、miR-181a对反流性食管炎复发的预测价值。结果观察组总有效率高于对照组(P<0.05)。治疗后,观察组的中医症状积分低于对照组(P<0.001),观察组的GAS、MTL水平高于对照组(P<0.001),观察组的白细胞介素(interleukin,IL)-1β、IL-6、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)水平均低于对照组(P<0.001),观察组miR-223水平低于对照组,miR-181a水平高于对照组(P<0.001)。血清miR-223水平与IL-1β、IL-6、TNF-α水平呈正相关(P<0.001),血清miR-181a水平与IL-1β、IL-6、TNF-α水平呈负相关(P<0.001)。miR-223为反流性食管炎复发的独立危险因素(OR=2.184,P<0.001),miR-181a为反流性食管炎复发的独立保护因素(OR=0.268,P<0.001)miR-223、miR-181a及二者联合预测的AUC分别为0.837、0.811、0.934,二者联合预测优于各自单独预测效能(Z=7.168、9.376,P<0.001)。结论中医“和法”联合针刺能提高胃癌术后反流性食管炎患者疗效,改善症状,调节胃肠激素,抑制炎症反应,降低血清miR-223水平,提高miR-181a水平,血清miR-223、miR-181a均是反流性食管炎复发的独立影响因素,二者联合对反流性食管炎复发有很好的预测价值。

递减法抗反流药物治疗胃食管反流病的疗效及预后分析

目的递减法抗反流药物治疗胃食管反流病的疗效及预后分析。方法选取2022年1月~2023年6月阳东区人民医院收治的胃食管反流病(GERD)患者80例为研究对象,将所有患者随机分为治疗组和对照组,治疗组给予8周口服泮托拉唑钠肠溶片、伊托必利分散片,采用递减法逐渐减低治疗剂量,对照组给予连续8周口服泮托拉唑钠肠溶片、伊托必利分散片常规治疗。比较两组患者恢复情况、复发率、不良反应、精神状况、细胞因子等水平差异。结果治疗后治疗组细胞因子水平明显低于对照组,差异有统计学意义(P<0.05)。治疗后治疗组胃食管反流病量表(RDQ)、症状消失时间明显低于对照组、镜下恢复率明显高于对照组,差异有统计学意义(P<0.05)。治疗后治疗组RDQ评分>12分的患者数量明显低于对照组,差异有统计学意义(P<0.05)。治疗后治疗组焦虑自评量表(SAS)、汉密尔顿抑郁量表(HAMD)、匹兹堡睡眠质量指数(PSQI)评分明显低于对照组,差异有统计学意义(P<0.05)。治疗组胃潴留、腹泻、便秘发生率显著低于对照组,差异有统计学意义(P<0.05)。结论递减法可以有效控制GERD症状及复发情况,有效缓解焦虑抑郁并改善了睡眠状况,不良反应发生率明显减少。

迷迭香粗提物提取工艺优化及其抑菌活性

迷迭香具有抑菌、抗氧化等生物活性,为获得有效抑菌成分,该研究通过单因素试验结合响应面试验优化迷迭香粗提物提取工艺;利用牛津杯法和滤纸圆片法对迷迭香粗提物抑菌作用进行研究,并确定其最低抑菌浓度。研究结果表明:迷迭香粗提物提取最优工艺条件为液料比7∶1(mL/g)、提取温度78℃、提取时间62 min、乙醇浓度60%、提取次数3次,在此条件下,迷迭香粗提物得率为(32.40±0.52)%。抑菌试验结果表明,迷迭香粗提物对食品中常见致病菌(如大肠杆菌、金黄色葡萄球菌、绿脓杆菌、蜡样芽孢杆菌)均具有较好的抑制作用,对大肠杆菌、金黄色葡萄球菌、绿脓杆菌、蜡样芽孢杆菌的抑菌圈直径分别为15.12、22.15、23.22、9.58 mm,最低抑菌浓度分别为50.0、12.5、25.0、25.0 mg/mL。

Study on Free Surface and Channel Flow Induced by Low Temperature Plasma via Lattice Boltzmann Method

Active boundary layer flow control and boundary layer manipulation in the channel flow that was based on low temperature plasma were studied by means of a lattice Boltzmann method. Two plasma actuators were placed in a row to obtain the influence rule of their separation distance on the velocity profile at three locations and maximum velocity in the flow field. Two plasma actuators were placed symmetrically inside a channel to examine the effect of channel height and voltage on the velocity profile and flow rate. It was found that the channel height controls the distribution of flow velocity, which affected the flow rate and its direction. Increasing plasma voltage had a negative effect on the flow rate due to the generation of a larger and stronger flow vortex.

Accurate positioning of the 24-hour pH monitoring catheter:Agreement between manometry and pH step-up method in two patient positions

瞄准：在二个不同耐心的位置调查在食道的测压法和 pH 加速方法之间的协议。方法：十八个题目在学习被包括。首先，到更低的食道的括约肌(LES ) 的近似边阶的从鼻子的距离被测量压力计的联盟者。然后一个不同调查者，被使看不见第一研究的结果，用 pH 加速方法测量了一样的距离，与病人在一起正直并且背卧位。对在二种技术之间的同意的一个评价被执行。结果：在背卧位，仅仅一个题目的测量在为正确的放接受的范围(对 LES 3 厘米远侧或近似的 【=) 外面。在正直的位置，在测量的错误在五个题目被认出。Bland-Altman 阴谋表明在大小之间的好同意获得了压力计的联盟者并且由在与在背卧位的病人一起的方法上面的 pH 步。结论：在情况中非压力计的察觉设备的可获得性， pH 加速方法能便于放在背卧位与病人一起监视导管的 24 h pH。如果我们的结果被进一步的研究支持，这应该与怀疑的胃的食道的倒流疾病为题目在临床的实践增加 pH-metry 的使用。

Elimination of hard aggregation of bismuth-doped tin dioxide nanometer powders prepared by wet chemical method

Bismuth-doped tin dioxide （BTO） nanometer powders were prepared by the wet chemical method using tin tetrachloride （SnCl4）, bismuth nitrate [Bi（NO3） 3 ] and ammonia as raw materials. Non-bridge hydroxides and capillary force between particles were found to be key factors causing hard aggregation of BTO through analyzing the formation mechanism of hard aggregation. The hard aggregation of BTO was eliminated effectively when the Bi-Sn precursor （BSP） was treated with post processing including dispersing with ultrasonic wave, refluxing and distilling with addition of n-butanol and benzene （DRD） and drying by microwave. Characterized with X-ray diffraction （XRD） and transmission electron microscopy （TEM）, BTO spherical particles with tetragonal phase structure are well crystallized, dispersed easily and the average size was less than 10 nm.

不同来源猫爪草总黄酮的提取工艺及其抗氧化活性研究

以猫爪草为原料,以猫爪草总黄酮得率为考核指标,在单因素试验的基础上,采用响应面法优化猫爪草总黄酮的乙醇回流提取工艺,并比较不同来源猫爪草中总黄酮得率及其抗氧化活性。结果表明:最佳提取工艺为提取时间91 min、乙醇体积分数81%、液料比21∶1(mL/g),在此条件下的猫爪草总黄酮得率为0.19%;10个不同来源的猫爪草中总黄酮得率有所差异,其中以河南信阳淮滨地区野生的最高,云南昆明西畴地区的最低;不同地区的猫爪草均具有一定的抗氧化性,其中河南信阳淮滨地区野生的抗氧化活性最强,对DPPH和ABTS自由基清除率分别为81.79%、82.43%,IC_(50)分别为0.487、0.280 mg/mL。

基于异病同治探讨肝胃百合汤治疗肝胃不和型反流性咽喉炎

反流性咽喉炎是由于胃内容物反流到咽部,刺激损伤咽部黏膜,以致咽部不适,或有物梗之,或咽干咽痒,或干咳声嘶,或频繁清嗓的疾病。中医称之为“慢喉痹”“梅核气”“吞酸”等,有学者研究发现肝胃不和型反流性咽喉炎在临床最为常见,其病机多责之肝气郁结,中焦气机不畅,胃气上逆以泛咽喉。基于中医异病同治,证同治亦同的原则,在治疗肝胃不和型反流性咽喉炎时,抓住关键病机,从肝胃论治。治法疏肝理气,和胃利咽,方用名老中医夏度衡经验方肝胃百合汤加减。附以病例详细剖析,为反流性咽喉炎的临床中医治疗提供新思路。

双有源桥DC-DC变换器的最小回流功率控制研究

针对DAB中存在的功率回流现象并以降低系统回流功率为目标,提出了一种基于EPS控制的回流功率优化控制策略。上述策略通过分析DAB的工作原理并运用KKT条件将约束条件转换为约束函数,然后建立拉格朗日多项式函数求极值,从而求得回流功率的最优解。同时,通过引入虚拟电压分量对变换器的传输功率进行实时估算与补偿,设计了一种直接功率补偿的控制方法,实现系统在突变情况下的快速响应能力。最后,仿真结果表明了所提优化控制策略优化回流功率的同时,也降低DAB的电流应力并改善其动态响应特性。