用低品位石灰石配料生产优质水泥熟料

分析了低钙、高镁石灰石物理性能对立窑熟料煅烧的影响。阐明只要合理选择配料方案,并加入萤石形成复合矿化剂以及采取适宜的工艺措施,可以配制生产符合ISO技术标准的优质早强水泥熟料。     

The effects of short-term jump training on bone metabolism in females using oral contraceptives

The purpose of this study was to determine the effect of oral contraceptive use on bone serum markers following a 3-week jumping protocol. Twenty-three females (18–25 years) were grouped as oral contraceptive users (OC+) or non-users (OC?). Following a 3-week observation period, participants completed a 3-week (15-day) jump protocol. Jump sessions consisting of ten 42 cm drop jumps with a 30 s rest interval between jumps were completed each day, 5 days per week. Peak vertical ground reaction force and loading rate were measured and the osteogenic index was calculated. Serum markers for bone formation, bone alkaline phosphatase (BAP) and bone resorption, C-terminal telopeptides of type I collagen (CTX) were measured at three time points (pre-, mid-, post-jump). BAP and CTX increased significantly (P = 0.0017, 0.0488) in both groups post-jump; however, bone metabolic markers were not different between the OC+ and OC? groups. Osteogenic index, ground reaction force and vertical jump height were similar between groups. Correlations between markers of bone metabolism and participants’ age at menarche, weight, loading rate and years on OC were not significant. A 3-week jumping protocol was found to be effective in stimulating bone metabolism in both OC+ and OC? groups.     

Serum markers for early diagnosis of non-‘Q’ wave and ‘Q’ wave myocardial infarction

The present study conducted on twenty-five uncomplicated cases of acute myocardial infarction diagnosed by clinical and electrocardiographic findings indicated significantly increased level of cardiac Troponin-T and increased activities of the enzymes total creatine kinase, creatine kinase-MB, aspartate transaminase and lactate dehydrogenase as compared to the twenty-five healthy control subjects. The level of cardiac Troponin-T and the activities of the enzymes total creatine kinase, creatine kinase-MB, aspartate transaminase and lactate dehydrogenase was found to be higher in “Q” wave myocardial infarction patients as compared to the non-“Q” wave and the controls. Since cardiac Troponin-T has been shown to increase in unstable angina and renal failure without cardiac disease and creatine kinase-MB activity has been found to be normal in patients with unstable angina and increase very slightly in patients with renal failure, it was concluded that a combination of cardiac Troponin-T and creatine kinase-MB activity was sufficient for the early diagnosis of acute myocardial infarction.     

钙离子对原子荧光测定锡的干扰

原子荧光测定锡的方法有许多文献都有记载,但对钙离子对测定锡的干扰在现有文献上还没有相关的记载。在实践中发现碳酸盐中测定锡时如不进行处理则有严重的负误差,在熔矿时加入一定量的EDTA可以消除这种干扰。     

利用工业电石渣合成硅酸钙保温材料

在确定了电石渣化学成分基础上,对所用原料电石渣和硅藻土900°С下进行锻烧预处理,在一定的反应温度、压力、保温时间下进行水热合成反应条件试验,探索硅酸钙保温材料的生成条件及影响因素。通过X射线衍射、电镜、差热等分析手段对合成产物进行分析,从而建立了用工业电石渣合成硅酸钙保温材料的合成工艺:用硅藻土与电石渣在120~180°С饱和蒸汽压气氛中进行水热合成反应所得的保温材料为托勃莫来石型硅酸钙。     

鸡蛋壳中钙分析的3种方法准确度研究

对3种传统测钙方法（酸碱滴定法、络合滴定法、氧化还原滴定法）的准确度进行了比较研究,结果表明：采用络合滴定法测定Ca,准确度高,耗时短,且方法简便易行,更适合用于教学实验和常量钙的快速测定.     

太极柔力球运动对老年女性血清雌激素、肌肉力量及认知功能的影响

目的:通过分析太极柔力球练习对老年女性血清雌激素、肌肉力量、手臂稳定性、光辨别反应时、长时及瞬时记忆保持量的影响,探讨太极柔力球运动提高老年女性肌肉力量及认知功能的可行性.方法:选取老年女性29人,分为对照组(14人)和锻炼组(15人),对两组血清雌二醇、左右手握力、红绿光辨别反应时、手臂稳定性及长时、瞬时记忆保持量等各项指标进行比较分析.结果:与对照组比较,老年女性太极柔力球锻炼组的血清雌二醇(76.85±15.36 pmol/L;P＜0.01)、右手握力(278.36±52.36 N;P＜0.01)、红绿光辨别反应时(0.42±0.15 s;0.60±0.21 s;P＜0.01,P＜0.05)、右手臂稳定性(3.65±0.52 mm;P＜0.01)、长时记忆保持量(0.55±0.09;P＜0.05)及瞬时记忆保持量(0.62±0.15;P＜0.05)差异均有显著性;左手握力(225.69±18.67 N)及左手臂稳定性(5.3±0.99 mm)较对照组增高,但无显著性差异(P＞0.05).结论:大极柔力球练习可增高老年女性的血清雌二醇水平,对提高老年女性的肌肉力量及认知功能具有积极作用,值得大力推广.     

高钙固硫粉煤灰在生产蒸压加气混凝土中的应用

本文是利用高钙固硫粉煤灰生产蒸压加气混凝土在实际生产成功后总结出的经验,表明高钙固硫粉煤灰完全能生产蒸压加气混凝土。     

运动和补钙对成年女性骨密度的影响

分析运动和补钙对年龄在20~59岁的成年女性骨密度的影响。方法:随机抽取浦东新区2400名成年女性,采用问卷调查了解受试者的生活方式,根据生活方式(运动、补钙)的不同进行分组,然后对不同组别的受试者进行超声骨密度衰减值测试。结果显示:20~29、30~39、50~59岁组的Ⅲ组、Ⅳ组骨密度显著高于Ⅰ组、Ⅱ组(P<0.05);30~39、40~49、50~59岁组Ⅱ组比Ⅰ组的骨密度高,但无显著性差异(P>0.05);30~39岁组的Ⅲ组、Ⅳ组骨密度显著高于Ⅰ组、Ⅱ组(P<0.01);20~29岁组的Ⅰ组骨密度比Ⅱ组高0.5dB/MHz,但无显著性差异(P>0.05)。结论:成年女性的骨密度与其是否长期坚持体育运动关系密切,而服用钙制剂和喝牛奶等补钙方法不是决定骨密度的直接因素。     

不同低氧训练方式对血脂、体重及其变化机理的研究

观察不同低氧训练方式对血清瘦素、下丘脑神经肽Y、下丘脑瘦素受体、血脂及其体重等指标的影响,探求低氧训练影响机体血脂、体重变化的机理。实验对象:SD大鼠50只,随机分为高住高训组(HiHi)、高住低训组(HiLo)、高住对照组(HiCo)、低训对照组(LoCo)和低住低训组(LoLo),进行4周不同低氧状态下的游泳训练。低氧环境的氧浓度为12.7%(相当于海拔4000m)。实验方法:血清leptin和下丘脑NPY用放射免疫分析法测定,血脂用全自动生化分析仪测定,下丘脑leptin受体采用放射配体检测法测定。结果:1)低氧暴露4周血清TC、TG、HDL、LDL升高;2)低氧训练4周,血清TC、HDL、TG、LDL降低,但HiLo组降低血清TG作用较HiHi组显著;3)低氧暴露和低氧训练4周,均观察到血清Leptin、下丘脑NPY有下降趋势;4)低氧暴露和低氧训练4周,下丘脑K1、K2没有变化,但下丘脑q1、q2分别增大。结论:1)低氧暴露4周可能有升高血脂的作用;2)低氧训练4周血脂可能降低;3)低氧暴露或低氧训练4周,下丘脑Leptin受体结合容量可能增大,使下丘脑NPY的分泌下降,抑制体重的增长。