Particle Size Distribution,Powder Agglomerates and Their Effects on Sinterability of Ultrafine Alumina Powders

An intensive study of the particle size distribution of four commercial ultrafine alumina powders to obtain information about the powder agglomeration and relate them to the compactibility and the sinterability has been made.

Effect of Limestone Powder on Microstructure of Concrete

The effect of limestone powder on microstructure of concrete was studied by using mercury intrusion porosimetry （MIP）, backscattering scanning electron（BSE）, scanning electron mi- croscopy （SEM） and X-ray diffraction （XRD） techniques. The experimental results show that the compressive strength of concrete containing 100 kg/m3 limestone powder can meet the strength requirement. Limestone powder has not pozzolanic activity; it is still unhydrated at the age of 28 days. But its filling effect can make the paste matrix and the interfacial transition zone between matrix and aggregate denser, which will improve the performance of concrete.

Effects of Spinach Powder Fat-Soluble Extract on Proliferation of Human Gastric Adenocarcinoma Cells

Four kinds of assays were used to study the effect of a fat-soluble extract of spinach powder (SPFE) on the proliferation of human gastric adenocareinoma cell line (SGC-7901) in vitro.These studies included: (Ⅰ) cell growth assay, (Ⅱ) colony forming assay, (Ⅲ) MTT colorimetric assay, and (Ⅳ) 3H-TdR incorporation assay. The concentrations of SPFE expressed as the level of β-carotene in the medium were 2×10-8, 2×10-7 and 2×10-6 mol/L β-carotene in assays (Ⅰ)～(Ⅲ), but 4×10- 8, 4×10-7 and 4×10-6 mol/L β-caretene in assay (Ⅳ) respectively. The results indicated that SPFE inhibited the prolifendion and colony forming ability of SGC-7901 cells. And in MTT assay, SPFE inhibited the viability of SGC7901 cells, but no inhibitory effect of SPFE was observed on the viability of lymphocytes in peripheral blood of healthy people. Finally, in the 3H-TdR incorporation test, both SPFE and β-carotene showed significant inhibitory effects on DNA synthesis in SGC-7901 cells, but SPFE was more effective than β-carotene.

DNADam ageEffectsofHydroxyapatiteUltrofinePowderonW-256 Sarcom a Cells and Lym phocytes in Rats

To explore the anticancer mechanism and DNA damages of hydroxyapatite ultrofine powder (HAUFP) on lymphocytes of rats, DNA damages in W 256 sarcoma cells and lymphocytes of rats were measured by single cell gel electrophoresis (SCGE). The results showed that HAUFP damaged DNA of W 256 sarcoma cells obviously but only cause slight damage of DNA of lymphocytes in rats. It is suggested that HAUFP selectively damaged DNA of tumor cells with only mild damage of lymphocyte DNA. HAUFP has powerful anticancer effect and little genetic toxicity.

Mechanism of Action of Rare Earths in High Effective Fe Powder Welding Rods

The optimum coating composition of alkali Fe powder welding rods was designed by orthogonal experiment with mix rates. A new kind of effective RE-Fe powder welding rod was prepared which could be used at the condition of direct and indirect current. The arc characteristics and stabilities of effective Fe powder welding rods containing RE were analyzed by HANNOVER analyzer. The efficiency of Fe powder welding rods was tested by weighting method. It was found that the stability of Fe powder welding rods was improved when it was added with rare earths. The results of impact experiment at low temperatures and SEM analysis on impact break showed that the grain was refined, the welding joint was cleaned, and the mechanical properties of joint was enhanced with proper RE content. It was provided with good processing property for this effective RE-Fe powder welding rod, and its efficiency could arrive at 180%.

Effect of Shengmal Powder(生脉散) on Symptoms and Markers of Inflammatory Damage of Patients with Acute Viral Myocarditis

Objective: To evaluate the efficacy of Sheng-mai Power (SMP) in treating acute viral myocarditis. Methods: 102 patients with acute viral myocarditis were randomized to SMS group (n = 52) and placebo control group (n = 50 ). Semiquantitative integral methods were taken to observe changes of clinical symptoms such as dyspnea, palpitation and chest pain after 4 weeks of treatment, simultaneously EKG, 24h Holter, concentration of serum cardiac troponin-I, cardiac troponin T and neutralizing antibody test to the Coxsackie B virus were determined. Results: Dyspnea improved much more obvious in SMP group than in the placebo

Sintering Effect on the Performance of Tungsten-copper Powder Liner

In order to study the properties of high-temperature sintered tungsten-copper powder shaped charge liner, the tungsten powder and copper powder, whose particle size is below 20 μm, were chosen as the main material. The mixed powder were directly pressed into the desired shape of the charge liner by the top direct-pressure way. The microscopic morphology of the spinning shaped charge liner, and the particle properties of the copper and tungsten powder were studied with scanning electron microscopy. The experimental results showed that the irregular copper powder and regular tungsten powder both are effectively and high- temperature sintering, which can improve the compactness of the powder liner effectively. The wall thickness and density of the no sintered and sintered liner were tested, showing that sintering thinned down the wall thickness and improved the density. The penetration depth of no sintered powder liner, sintered powder liner and the spinning copper plate liner were respectively tested in different standoff, showing that the penetration properties of sintered powder liner are well.

Effects of Qishen Ultrafine Powder on Immune Efficacy in Chickens

[Objective] This paper aimed to observe the effects of Qishen ultrafine powder on immune efficacy of infectious bursal disease vaccine in chickens. [ Method] 360 1-day-old chickens were randomly divided into six groups equally, and group I -V were vaccinated with IBD live virus vaccine on the 21 th and 35th day, respectively. From 14th to 21th day, group I - Ⅲ were added with 1%, 0.5% of Qishen ultrafine powder and 2% of Qishan powder in basel diet, respectively, group IV was given Yupingfeng oral liquid and group VI was as a control group without vaccination. Be- fore the expedment （14-day-old chickens as DO ） and 7 （ D7 ）, 14 （ D14 ）, 21 （ D21 ）, 28 （ D26 ）, 35 （ D36 ）, 42 （ D42 ） days after the experiment, the dynamic change of serum IBD specific antibody was determined, respectively. On D7, D21 and D36, the dynamic change of peripheral T lymphocyte proliferation and IL-2 in serum were determined, respectively. The weight change was also observed. [Results] Compared with the immune control group, the immune effects of IBD vaccine of each administration group were significantly improved, and there was no significant difference between each other. [ Condusion] Qishen ultrafine powder could increase immune function of chickens at lower dosage.

葡萄孢属菌株HY-021可湿性粉剂的制备及除草作用

为了进一步明确葡萄孢属Botrytis菌株HY-021除草活性,采用单因素法筛选该菌株的最适固体发酵基质、适宜载体和助剂,制备可湿性粉剂,并进行盆栽接种评价其除草活性。结果表明:HY-021菌株最适生长的固态基质为玉米粉,最优配方组合为:麦秆糠14.5 g+麦麸19.4 g+菜籽饼1.5 g+玉米粉14.6 g。适宜的载体、稳定剂、分散剂、保护剂和润湿剂分别为高岭土、轻质碳酸钙、羧甲基纤维素钠、可溶性淀粉和十二烷基硫酸钠。菌株HY-021可湿性粉剂对苗期盆栽的藜、密花香薷、猪殃殃3种杂草有较好除草活性,其中对藜和猪殃殃表现出较强的致病性,致病率分别为85.83%、89.45%,鲜重防效分别为81.82%、87.16%。本试验制备的HY-021生防菌株可湿性粉剂,可作为生防菌剂有效控制藜和猪殃殃等杂草。

加味四妙散对湿热痹阻型慢性痛风性关节炎炎症因子的影响及相关性分析

目的:通过分析慢性痛风与白细胞介素-1β(IL-1β)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)与中医症状及临床指标间存在的关联性,探究加味四妙散治疗慢性痛风的作用机制。方法:60例符合纳入标准的湿热痹阻型慢性痛风性关节炎患者,依据随机数字表随机分为观察组和对照组各30例,同时设健康组30例。对照组给予口服非布司他治疗;观察组在对照组的基础上联合加味四妙散治疗,治疗周期为4周。观察患者一般临床资料、中医症状积分、生化学指标,同时采用酶联免疫吸附法(ELISA)测定IL-1β、TNF-α和IL-6水平,分析IL-1β、IL-6、TNF-α与中医证候积分及生化学指标的相关性。结果:与健康组相比,慢性痛风患者IL-1β、TNF-α、IL-6水平显著升高(P<0.01);慢性痛风患者关节疼痛、关节肿胀、大便黏滞及舌象与IL-1β、TNF-α和IL-6呈正相关,关节压痛、关节发热及身体倦怠与IL-1β、TNF-α呈正相关;黏腻、口苦及小便与TNF-α呈正相关,脉象与IL-1β呈正相关,IL-1β与FPG、TC、ESR、VAS评分呈正相关,TNF-α与BMI、UA、HDL、ESR、VAS评分呈正相关,与HDL呈负相关,IL-6与SBP、UA、CRP呈正相关(P<0.05,P<0.01);两组患者治疗后组内比较,IL-1β、TNF-α和IL-6水平显著降低(P<0.01),组间比较,观察组IL-1β水平较治疗组显著降低(P<0.05);与本组治疗前比较,两组患者关节疼痛,关节压痛,关节肿胀,关节发热,活动障碍,身困倦怠,黏腻、口苦,小便黄赤,舌象中医症状评分均明显降低(P<0.05,P<0.01)。与对照组治疗后比较,观察组患者关节发热,身困倦怠,黏腻、口苦,大便黏滞,小便黄赤,舌象,脉象积分均明显降低(P<0.05);与本组治疗前比较,BMI、SBP、DBP、UA、Scr、BUN、FPG、LDL、TG、TC、ESR、CRP、IL-1β、TNF-α、IL-6水平及VAS评分均明显升高(P<0.05,P<0.01);与对照组治疗后比较,观察组患者BMI、ESR、IL-1β水平及VAS评分均明显降低(P<0.05)。观察组总有效率为80.0%(24/30),对照组总有效率为56.7%(17/30),观察组总有效率明显高于对照组,差异具有统计学意义(χ^(2)=11.916,P<0.05)。结论:痛风患者的IL-1β、IL-6、TNF-α水平与肥胖、血糖、血脂、UA、关节肿痛、炎症状况及全身症状密切相关;加味四妙散可有效改善湿热痹阻型慢性痛风性关节炎的临床症状并减轻炎症反应,且有较好的安全性,其机制可能与抑制IL-1β相关炎症信号通路有关。

喂料方式对粉体气力分级性能的影响及成因分析

【目的】为了提高粉体气力分级设备的分级性能,研究螺旋喂料和振动喂料2种不同喂料方式对气力分级性能的影响。【方法】采用高速摄像机对不同喂料方式下粉体下落运动(喂料)进行图像采集,运用图像处理技术对采集到的图像进行处理,通过图像观察法和引入喂料时连续时刻粉体面积分布变异系数分析喂料方式对粉体分散性的影响;通过碳酸钙粉体分级实验方法探讨喂料方式对分级性能的影响。【结果】相较于螺旋喂料,振动喂料有利于粉体解团,提升粉体喂料时的均匀性和分散性;相较于螺旋喂料方式,振动喂料有助于提升气力分级机的分级性能,尤其在较高的喂料速度下,分级性能提升效果显著,喂料速度为18 kg/h时,分级精度提升185%,旁路值减小75%,“鱼钩效应”峰值点高度降低29%;粒径小于10μm的超细颗粒在粗粉中占比从螺旋喂料时的11.4%减小到振动喂料时的4.4%,粗粉中细粉占比大幅减小,粗细颗粒分离效果得到改善。【结论】螺旋喂料不适合输运黏性较强、流动性较差的粉体,如碳酸钙;振动喂料可改善粉体材料的喂料均匀性和分散程度,有利于提高气力分级机分级性能。

0.3%氯化血红素可湿性粉剂对马铃薯生长与品质的调节效果

为了明确0.3%氯化血红素可湿性粉剂对马铃薯生长的调节效果,确定最佳用量,以克新6号马铃薯为材料,以8%甲哌鎓可湿性粉剂和清水分别作为药剂和空白对照,采取随机区组排列开展田间应用试验,分析不同用量0.3%氯化血红素可湿性粉剂配施专用助剂(SD)对马铃薯生长、产量及品质的影响。结果表明:处理1—处理5(667 m^(2)分别施用0.3%氯化血红素可湿性粉剂10、20、30、40、0 g,并配施SD 20 g)平均株高、全叶鲜质量、茎粗和小区平均产量均较空白对照有所增加,且均以处理4(667 m^(2)施用0.3%氯化血红素可湿性粉剂40 g+SD 20 g)最大,处理3(667 m^(2)施用0.3%氯化血红素可湿性粉剂30 g+SD 20 g)次之,2者小区平均产量较空白对照分别极显著增加13.80%、10.73%,但与药剂对照差异均不显著;处理1—处理5马铃薯块茎干物质量、淀粉含量、还原糖含量和VC含量等也均较空白对照有所增加,其中以处理4最高,处理3次之,2者均显著高于空白对照。安全性评价表明,各处理对马铃薯均是安全的。在马铃薯生产上,推荐每667 m^(2)使用0.3%氯化血红素可湿性粉剂30~40 g+SD 20 g。

CeO_(2)添加量对电弧增材制造铁基形状记忆合金组织和性能的影响

采用粉芯丝材+电弧增材制造技术制备了含不同质量分数(0,1%,2%,3%)CeO_(2)的Fe-14Mn-6Si-9Cr-5Ni铁基形状记忆合金,研究了CeO_(2)添加量对试验合金显微组织和形状记忆性能的影响。结果表明:添加质量分数1%的CeO_(2)后,合金晶内析出相减少,晶界处析出较大尺寸的稀土化合物,组织均匀,弯曲变形后未出现ε马氏体跨晶生长现象,且马氏体交叉状态较少;当CeO_(2)质量分数增加至2%和3%时,晶内析出相增多,分布均匀性变差,且在弯曲变形后ε马氏体跨晶生长和交叉特征增多;随着CeO_(2)添加量增加,试验合金的晶粒尺寸减小,层错概率增大,形状回复率先增大后减小,当CeO_(2)质量分数为1%时晶粒尺寸较小,层错概率较大,形状回复率最大,形状记忆性能最好。

俄歇电子能谱测试中非导电粉末样品的荷电效应及消除方法

俄歇电子能谱在分析绝缘样品时,要得到正确的谱图,荷电效应是一个重要的影响因素。本文选取Al_(2)0_(3)粉末为例,提出了俄歇电子能谱分析Al_(2)0_(3)粉末样品的制样方法,通过对比几种减少荷电效应的实验,选取了以覆盖铝导电膜的方法进行实验。此方法流程简便、高效,降低了因荷电效应的影响,通过对Al203的标准摩尔比进行匹配,得到了比较好的匹配度。此方法检测结果较好。

玉屏风散加减联合西药治疗促进轻型新冠病毒感染孕妇核酸转阴的疗效观察

[目的]探讨玉屏风散加减联合西药治疗轻型新冠病毒感染孕妇的临床疗效。[方法]以上海市公共卫生临床中心2022年4月至6月收治的轻型新冠病毒感染孕妇作为研究对象,随机分成治疗组(48例)及对照组(52例)。对照组给予退热、止咳对症及维生素C等西药治疗,治疗组在对照组基础上给予玉屏风散加减治疗。对比两组患者治疗前后的各症状积分、不良妊娠结局发生率、总有效率和淋巴细胞、C反应蛋白、白细胞介素-2受体、白细胞介素-6等实验室指标变化,并观察两组患者病毒核酸转阴和疾病转归情况。[结果]与对照组比较,治疗组症状总积分显著下降(P<0.001),总有效率显著升高(P<0.01),炎症指标C反应蛋白、白细胞介素-6水平较前显著下降(P<0.001,P<0.01),而淋巴细胞计数较前显著升高(P<0.001),不良妊娠结局发生率两组间差异无统计学意义(P>0.05)。[结论]玉屏风散加减联合西药治疗可显著改善轻型新冠病毒感染孕妇的临床症状,缩短核酸转阴时间,且不会增加不良妊娠结局,具有一定的临床价值,值得临床推广应用。

含氟材料助燃硼粉研究进展

系统综述了含氟材料助燃硼粉的研究进展,并分析了助燃机制。研究表明,不论无机含氟材料、有机含氟材料还是自组装含氟材料,对硼粉燃烧都有一定的助燃效果。但是,不同含氟材料对硼粉的助燃效果有很大差异,新兴的自组装含氟材料结构规整,可能极具应用价值,值得深入研究。分析表明,含氟材料的助燃机制为氟自由基或含氟基团的自由基的催化作用,该发现对材料的应用场景具有重要参考意义。综合大量文献研究,作者首次提出,氢含量低、易于热解且热解时易产生氟原子及含氟烷烃、含氟烯烃的自由基的材料,对硼粉会具有更好的助燃效果。研究结果预计对火炸药行业从业者会有重要的参考价值。

一种适用于随钻核磁天线的磁芯材料

介绍了一种随钻核磁天线的铁粉芯磁芯材料,该材料具备高饱和磁通密度,并具备较低的介电损耗,并具备高绝缘强度,并在强磁环境下不产生磁致伸缩效应,较好的解决了随钻核磁测井仪探头敏感区域设计需求。

运脾止泻方结合神阙灸治疗小儿泄泻临床效果观察

目的观察运脾止泻方结合神阙灸治疗小儿泄泻临床效果。方法本次合计纳入79例泄泻患儿(2020年7月—2022年10月)进行研究,以随机数字表法分成参照组与观察组,分别为39例、40例,参照组患儿采取基础治疗+蒙脱石散治疗,观察组患儿在参照组治疗基础上联合运脾止泻方及神阙灸治疗,数据观察:患儿临床疗效、止泻时间及腹痛消失时间、大便正常时间、大便质地及大便质量、大便性状评分、治疗前后患儿中医证候(大便稀薄、形体消瘦、面色萎黄、神疲倦怠等)积分变化、C反应蛋白(C-reactive protein,CRP)水平变化、治疗前后患儿肠道菌群(肠球菌、酵母真菌、乳杆菌)变化情况、用药不良反应情况以及患儿家属治疗满意率。结果参照组患儿治疗总有效率为82.05%(32/39),低于观察组患儿97.50%(39/40),P<0.05;与参照组患儿比较,观察组止泻时间及腹痛消失时间、大便正常时间均更短,大便质地及大便质量、大便性状评分均更佳,P均<0.05;两组患儿治疗前中医证候(大便稀薄及形体消瘦、面色萎黄、神疲倦怠等)积分及CRP水平比较,P>0.05,两组患儿治疗后中医证候(大便稀薄及形体消瘦、面色萎黄、神疲倦怠等)积分、CRP水平均改善,治疗后观察组患儿中医证候(大便稀薄及形体消瘦、面色萎黄、神疲倦怠等)积分、CRP水平优于参照组患儿,P<0.05;治疗前各组患儿肠道菌群(肠球菌、酵母真菌、乳杆菌)比较,P>0.05,治疗后各组患儿肠球菌与乳杆菌均显著上升,而酵母真菌均下降,观察组患儿治疗后肠球菌与乳杆菌数量多于参照组,酵母真菌比参照组少,P<0.05;观察组患儿无不良反应(0.00%),参照组出现1例呕吐(2.56%),可自行缓解,P>0.05;观察组患儿家属满意率(97.50%,39/40)显著高于参照组患儿家属满意率(82.05%,32/39),P<0.05。结论运脾止泻方结合神阙灸治疗小儿泄泻临床效果显著,可较好改善患儿肠道菌群情况,从而改善患儿的临床症状,提升治疗效果,治疗安全可靠,患儿家属较为认可,值得应用。

当归芍药散与布洛芬口崩片治疗原发性痛经气滞血瘀证的疗效比较

目的 比较当归芍药散与布洛芬口崩片治疗原发性痛经气滞血瘀证的临床疗效。方法 前瞻性选取2020年1月—2023年12月琼海市中医院收治的原发性痛经气滞血瘀证患者144例作为研究对象,采用随机数字表法分为西药治疗组和中药治疗组,各72例。西药治疗组患者接受布洛芬口崩片治疗,中药治疗组患者接受当归芍药散治疗。2组患者均连续治疗3个月经周期。比较2组临床疗效,治疗前后痛经程度评分、血清学指标[前列腺素F_(2)α(PGF_(2)α)、前列腺素E_(2)(PGE_(2))]。结果 中药治疗组患者治疗总有效率为93.06%,高于西药治疗组的77.78%(χ^(2)=6.746,P=0.009)。治疗3个月经周期后,2组患者痛经程度评分低于治疗前,且中药治疗组低于西药治疗组(P<0.01);2组患者血清PGF_(2)α水平低于治疗前,血清PGE_(2)水平高于治疗前,且中药治疗组低/高于西药治疗组(P<0.05或P<0.01)。结论 采用布洛芬口崩片及当归芍药散治疗原发性痛经气滞血瘀证均能通过降低PGF_(2)α、提高PGE_(2)水平而减轻痛经程度,但当归芍药散的效果更佳。

压强对纳米铝粉点火和燃烧特性的影响

为了揭示压强对纳米铝(n-Al)粉点火和燃烧特性的影响,利用高压燃烧实验台对n-Al粉堆进行了0.1~3.5 MPa的激光点火实验研究。采用高速摄像仪、三色测温仪和光谱分析仪同步获取颗粒堆着火、火焰演变、表面辐射温度和特征辐射光谱等信息,分析了n-Al粉堆点火和燃烧特性。结果表明,空气气氛中的n-Al粉堆在1.5 MPa时,燃烧时间最短且最充分,剧烈燃烧阶段占比最大。随着压强的增加,n-Al粉的燃烧火焰强度和特征辐射光谱均增强,三个燃烧阶段时间从常压下的254.03、864.24、922.69 ms分别缩短至1.0 MPa时的118.85、435.69、452.50 ms,总燃烧时间缩短了50.65%。点火延迟时间和燃烧时间均随压强增加呈现非线性曲线的变化趋势,在0.1~1.5 MPa范围内,提高空气压强可以减小n-Al粉的燃烧时间,增大火焰锋面,提升最高燃烧火焰温度,促进气相燃烧。但过高的压强(1.5~2.5 MPa)会阻碍n-Al粉点火及火焰发展,减小剧烈燃烧阶段占比进而增大燃烧时间,引起中压熄火现象。