The Thermographic Analysis of the Agglomeration Process in the Roller Press of Pillow-Shaped Briquettes

When the briquetting process of fine-grained material takes place in the roller press unit, the pressure reached is over a hundred megapascals. This parameter is a result, among other factors, of the geometry of a compaction unit and also the properties of the consolidated material. The pressure of the unit is not constant and the changes in value depend on a given place on the molding surface. By the process of generating different types of pressure on the surface of briquettes, their compaction is different as well. The distribution of temperature on the surface of the briquettes may determine the pressure used locally on them. Nevertheless, the distribution of stress in the briquetting material is still a subject of scientific study. However, it is known that the pressure exerted on the briquette is different for different compaction systems. The article includes authors’ further thermography studies on the classical pillow-shaped briquetting process (instead of the saddle-shaped ones that were previously conducted) of four materials (calcium hydroxide and water mixture, mill scale, charcoal fines and starch mixture, as well as a mixture of EAFD, scale, fine coke breeze, molasses, and calcium hydroxide). Immediately after the briquettes left the compaction zone, thermal images were taken of them, as well as forming rollers. Thermograms that were obtained and the variability of temperature at characteristic points of the surface of pillow-shaped briquettes were analyzed. They showed differences in temperature on the surface of briquettes. In all four cases, the highest briquette temperatures were recorded in their upper part, which proves their better densification in this part. The temperature differences between the lower and upper part of the briquettes ranged from 1.8 to 9.7 °C, depending on the mixture.     

不同种植体表面性质对雪旺细胞生物学行为影响的研究

目的 探讨不同种植体表面性质对于雪旺细胞(SCs)生物学行为的影响.方法 将SCs接种于3种种植体表面,分别是光滑表面(SMO)、大颗粒喷砂酸蚀表面(SLA)和亲水性化学活化大颗粒喷砂酸蚀表面(modSLA).接种不同时间后,采用扫描电子显微镜观察钛片表面的SCs形态和黏附,MTT法检测细胞增殖活性,酶联免疫吸附测定法...     

Energy Transport along α-Helix Protein Chains: External Drives and Multifractal Analysis

Energy transport within biological systems is critical for biological functions in living cells and for technological applications in molecular motors. Biological systems have very complex dynamics supporting a large number of biochemical and biophysical processes. In the current work, we study the energy transport along protein chains. We examine the influence of different factors such as temperature, salt concentration, and external mechanical drive on the energy flux through protein chains. We obtain that energy fluctuations around the average value for short chains are greater than for longer chains. In addition, the external mechanical load is the most effective agent on bioenergy transport along the studied protein systems. Our results can help design a functional nano-scaled molecular motor based on energy transport along protein chains.     

表面封闭剂应用于复合树脂修复楔状缺损的临床疗效观察

目的：观察表面封闭剂用于楔状缺损充填的临床效果。方法：门诊选择138例楔状缺损病例,随机分为二组,用可乐丽菲露进行充填,试验组69例充填后用表面封闭剂封闭充填体及边缘,另69例为空白对照组,分别于1年及2年后对充填体进行临床评价。结果：使用表面封闭剂组1年成功率为96.7%,2年成功率为92.9%,未使用组1年成功率为93.2%,2年成功率为87.6%。结论：楔状缺损在树脂充填后使用表面封闭剂可获得较好的边缘封闭性。     

对新生儿硬肿症恒温湿化氧疗的临床研究

为探讨对新生儿硬肿症的恒温湿化氧疗,根据生物氧化机理,将１９９７ 年１ 月至１９９８ 年８ 月入院的１２５ 例新生儿硬肿症患儿随机分成两组,在综合治疗护理上的基础上,研究组（ Ａ 组）６５ 例实施恒温湿化氧疗,对照组（ Ｂ 组）６０ 例按传统吸氧方式和吸氧指征给氧。观察比较两组治疗效果,结果显示 Ａ 组比 Ｂ 组不仅缩短了复温时间、硬肿消退时间和平均住院日（ Ｐ 均＜ ０ ．００１） ,而且减少了并发症,提高了治疗效果（ Ｐ 均＜ ０ ．００５） 。     

上臂表面肌电信号与肘关节角度的相关性研究

目的 根据检测的上臂肱二头肌和肱三头肌表面肌电信号,研究表面肌电信号和肘关节角度之间的相关性.方法 在手握恒定目标力量时提取表面肌电信号,并分别从时域采用均方根和积分肌电值方法提取肌电信号的特征值.结果 实验结果表明肱二头肌和肱三头肌上的肌电信号幅度的均方根和积分肌电值的变化规律是不同的,前者的肌电信号幅度的均方根和积分肌电值都是随着肘关节角度的增加而增大,而后者的2种值都在肘关节弯曲90°时最大,在45°和135°时的值非常接近.结论 肱二头肌和肱三头肌的表面肌电信号,可以反映肘关节角度.     

Newer P2Y12 Inhibitors vs Clopidogrel in Acute Myocardial Infarction With Cardiac Arrest or Cardiogenic Shock: A Systematic Review and Meta-analysis

ObjectiveTo evaluate the outcomes, safety, and efficacy of dual antiplatelet therapy (DAPT) with newer P2Y₁₂ inhibitors compared with clopidogrel in patients with acute myocardial infarction (AMI) complicated by cardiac arrest (CA) or cardiogenic shock (CS).Patients and MethodsMEDLINE, EMBASE, and the Cochrane Library were queried systematically from inception to January 2021 for comparative studies of adults (≥18 years) with AMI-CA/CS receiving DAPT with newer P2Y₁₂ inhibitors as opposed to clopidogrel. We compared outcomes (30-day or in-hospital and 1-year all-cause mortality, major bleeding, and definite stent thrombosis) of newer P2Y₁₂ inhibitors and clopidogrel in patients with AMI-CA/CS.ResultsEight studies (1 randomized trial and 7 cohort studies) comprising 1100 patients (695 [63.2%] receiving clopidogrel and 405 [36.8%] receiving ticagrelor or prasugrel) were included. The population was mostly male (68.5%-86.7%). Risk of bias was low for these studies, with between-study heterogeneity and subgroup differences not statistically significant. Compared with the clopidogrel cohort, the newer P2Y₁₂ cohort had lower rates of early mortality (odds ratio [OR], 0.60; 95% CI, 0.45 to 0.81; P=.001) (7 studies) and 1-year mortality (OR, 0.51; 95% CI, 0.36 to 0.71; P<.001) (3 studies). We did not find a significant difference in major bleeding (OR, 1.21; 95% CI, 0.71 to 2.06; P=.48) (6 studies) or definite stent thrombosis (OR, 2.01; 95% CI, 0.63 to 6.45; P=.24) (7 studies).ConclusionIn patients with AMI-CA/CS receiving DAPT, compared with clopidogrel, newer P2Y₁₂ inhibitors were associated with lower rates of early and 1-year mortality. Data on major bleeding and stent thrombosis were inconclusive.     

兰州市日均气温对两所三甲医院门诊湿疹人次的影响

目的 探讨兰州市日均气温对门诊湿疹人次的影响.方法 收集2007年1月1日至2015年12月31日兰州地区两所三甲医院皮肤科门诊湿疹患者的资料和同时期气象数据,在控制长期趋势、星期几效应的基础上,采用分布滞后非线性模型,通过quasi-Poisson连接函数进行拟合,并根据季节、性别和年龄分层后分析日均气温对湿疹门诊人次的影响.结果 日均气温与湿疹门诊人次的暴露-反应关系大致呈“W”型.按照季节、性别、年龄分层后,日均气温改变对湿疹门诊人次的影响主要以秋、冬季为重,夏季次之,春季最弱.低温对湿疹的影响可能存在滞后作用、累积作用及持续作用,即在-9℃、滞后14d时,RR值为1.12(95％ CI:1.03～ 1.22),达到最大,且温度每降低1℃,男性、青少年、中年人群湿疹发病的风险分别增加16％(RR:1.16,95％ CI:1.05～ 1.27)、14％(RR:1.14,95％ CI:1.02 ～ 1.26)及13％(RR:1.13,95％ CI:1.02～1.25),均有统计学意义(P＜0.05);而在女性及老年人群中,低温对湿疹的影响均不具有统计学意义(P＞ 0.05).高温的影响效应在暴露当天即已出现,随着滞后日的推移其影响效应渐减弱,但这种效应无统计学意义(P＞ 0.05).结论 在兰州地区日均气温对湿疹门诊人次的影响以秋、冬季为重,日均气温的改变可能为湿疹患者的危险因素之一,且低温对湿疹的影响存在滞后作用,滞后时间约为14d.     

Developing an international standard for the classification of surface anatomic location for use in clinical practice and epidemiologic research

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湘黔渝边区女性体表面积

目的:研究湘黔渝边区女性苗族女性身高、体质量、体表面积值,为建立苗族女性健康指标评价体系提供依据。方法:采用人体测量方法测量该区汉族、苗族女性的身高、体质量值,并利用Stevenson公式计算女性的体表面积。结果:苗族女性身高随着年龄增高而逐渐降低、体质量随着年龄增高而逐渐增加;30~40岁之间苗族体表面积高于汉族,其他年龄段苗族体表面积值均低于汉族。结论:湘黔渝边区苗族女性体表面积整体发育水平低于汉族女性。因此,需建立独立的健康指标评价体系。