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张子丰 《河北能源职业技术学院学报》2006,6(3):73-74
范各庄社区服务中心生活科西锅炉房安装的六台蒸汽锅炉,供热能力为100吨/时,作为供热热媒的蒸汽采暖系统,目前普遍存在着凝结水回收率低,热源浪费严重的现象.本文通过研究凝结水回收的经济效益和凝结水回收中的技术难点,目的是为蒸汽锅炉房的运行管理和节支降耗提供技术支持和理论研究. 相似文献
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应用反向间接血凝检测畜禽血清中人类乙型肝炎表面抗原,结果各种畜禽血清均发现有阳性,且比率甚高(18.3-30.9％)。笔者试将受检血清分别经过HRBc吸收,抗HBs中和等方法处理,发现畜禽血清存在HRBc天然凝集素和与HBsAg不同的类似抗原,这些非特异性因素使血凝试验出现高比率的阳性,因此,在动物血清做反向间接血凝前,应设法排除非特异性因素、结果较为可靠。 相似文献
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1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｃｏａｇｕｌａｔｉｏｎｉｓａｎｉｒｒｅｖｅｒｓｉｂｌｅ ｐｈｙｓｉｃａｌ ｐｒｏｃｅｓｓｉｎｗｈｉｃｈａｎｕｍｂｅｒｏｆｂａｓｉｃｕｎｉｔｓ(ｍｏｎｏｍｅｒｓ)ｓｔｉｃｋｔｏｇｅｔｈ ｅｒｔｏｂｕｉｌｄｃｌｕｓｔｅｒｓ.ＴｈｅｔｉｍｅｅｖｏｌｕｔｉｏｎｏｆｃｌｕｓｔｅｒｉｎｇｐｒｏｃｅｓｓｃａｎｂｅｄｅｓｃｒｉｂｅｄｂｙｔｈｅＳｍｏｌｕｃｈｏｖｓｋｉｅｑｕａ ｔｉｏｎ[1 ],ｗｈｉｃｈｉｓｄ Ｃｋｄ ｔ =12 ∑ｉ ｊ=ｋＫ(ｉ,ｊ)ＣｉＣｊ-Ｃｋ∑ｊＫ(ｊ,ｋ)Ｃｊ,(1)ｗｈｅｒｅＣｋｄ… 相似文献
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Yan-Qiu Han Li Yan Lei Zhang Pei-Heng Ouyang Peng Li Giuseppe Lippi Zhi-De Hu 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2021,31(2)
IntroductionThe prognostic value of D-dimer (DD) in sepsis remains controversial. This study aimed to investigate the performance of DD for predicting sepsis mortality in the hospital and for identifying its potential correlates.Materials and methodsThe clinical and laboratory data of adult sepsis patients were extracted from the Medical Information Mart for Intensive Care III (MIMIC III, v1.4) database using the structured query language (SQL). The database contains critical illness admitted to the intensive care unit at Beth Israel Deaconess Medical Center between June 2001 and October 2012. The association between DD and mortality was investigated with receiver operating characteristic (ROC) curve, restricted cubic spline and logistic regression analysis. Subgroup analysis was also used for identifying DD correlates.ResultsThe study population consisted of 358 sepsis patients. Those who died during hospital stay (N = 160) had significantly higher DD values than those who survived (N = 198). The area under the ROC curve (AUC) of DD was 0.59 (P < 0.010). In subgroup analysis, white blood cell (WBC) count > 18 x109/L and vasopressor therapy significantly decreased DD diagnostic performance. Categorical DD value was independently associated with hospital mortality after sequential organ failure score (SOFA) and blood lactate adjustment. Restricted cubic spline analysis revealed a U-shape relationship between DD and in-hospital mortality.DiscussionWe conclude that the accuracy of DD for predicting in-hospital sepsis mortality depends on WBC count and vasopressor therapy. Both low and extremely elevated DD values are associated with higher risk of death. 相似文献
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Background
The preanalytical phase represents the major source of variability in laboratory diagnostics. Our aim was to assess to what extent underfilling of primary blood tubes may impact upon routine coagulation testing.Materials and methods:
Blood was drawn by syringe from 21 healthy volunteers and 6 patients on warfarin therapy, and immediately transferred into 3.6 mL vacuum tubes containing 3.2% sodium citrate (Terumo Europe N.V., Leuven, Belgium). All tubes were filled using standardized volumes of whole blood to produce scalar amounts of filling: 3.6 mL (i.e., 100%), 3.2 mL (89%), 2.8 mL (78%) and 2.4 mL (67%). Samples were mixed and centrifuged at 1300 × g for 10 min. The plasma was tested for prothrombin time (PT), activated partial thromboplastin time (APTT) and fibrinogen (FBG) on ACL TOP (Instrumentation Laboratory - IL, Milan, Italy), using IL reagents. A polynomial plot was derived for each parameter from interpolation of clotting values obtained with different percentages of filling, and these plots were compared with quality specifications (± 2.0 for PT, ± 2.3 for APTT and ± 4.8 for FBG) to calculate the minimal filling volume required to produce clinically acceptable results.Results:
The equations were (PF, Percentage of filling): PT (sec) = 3.375 × PF^2–6.255 × PF + 17.806 (r = 0.980); APTT (sec) = 8.925 × PF^2–23.578 × PF + 46.356 (r = 0.979); and FBG (mg/dL) = −311.5 × PF^2 + 422.1 × PF + 147.07 (r = 0.994). According to these equations, the minimum allowed thresholds of blood tubes filling were > 61% for PT, > 87% for APTT and > 71% for FBG.Conclusions:
Our results confirm that routine coagulation testing performed on underfilled tubes may generate biased and clinically misleading test results. This is particularly critical for APTT, wherein tubes filled at less than ∼90% generate unreliable data. The FBG and the PT seem more resistant to underfilling, clinical significant biases being observed only where blood tubes were filled at less than ∼60 and ∼70%, respectively. 相似文献17.
硫酸亚铁法处理电镀含氰废水的试验研究 总被引：4，自引：0，他引：4
熊正为 《湖南科技学院学报》2007,28(9):49-52
对硫酸亚铁法处理电镀含氰废水进行了试验研究，探讨了硫酸亚铁除氰的原理及其去除效果。试验结果表明：用硫酸亚铁法处理电镀含氰废水，氰化物的去除率可达97％左右，而且处理费用低，操作简便，具有广泛的应用前景。 相似文献
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有氧运动对大鼠血糖、血脂和血液凝固功能的影响 总被引：3，自引：0，他引：3
章罗庚 《北京体育大学学报》2009,(7)
目的:研究有氧运动(游泳)对大鼠血糖、血脂和血液凝固功能的影响。方法:30只SD大鼠进行不同强度的游泳训练后,测定其血糖、血脂、血浆组织因子(TF)活性、组织因子途径抑制物(TFPI)抗原、组织型纤溶酶原激活物(t-PA)和纤溶酶原激活剂抑制物-1(PAI-1)的活性。结果:1)与对照组相比,运动对大鼠血糖有降低趋势,但差异无统计学意义(p>0.05);2)小强度运动使大鼠血清LDL明显降低(p<0.05),大强度运动具有升高血清LDL的趋势;3)小运动组大鼠血清HDL浓度呈逐渐升高趋势,而大强度组的大鼠血清HDL明显降低(p<0.05);4)小强度游泳运动后,血浆t-PA活性及t-PA/PAI-1比值明显升高(p<0.01),PAI-1活性却明显降低(p<0.05);大强度游泳运动组t-PA活性没有明显改变,PAI-1活性有所升高;5)与对照组相比,运动训练使TFPI水平升高,其中小强度组TFPI含量(p<0.05)和TFPI/TF比值显著性升高(p<0.01),大强度组的TF含量有所升高,而TFPI/TF比值变化不明显(p>0.05)。结论:小强度的运动训练可以改善机体的凝血和纤溶功能,而大强度的训练不利... 相似文献
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EM和高分子絮凝剂对庆大霉素生产废水进行处理，结果显示单独使用EM时最佳的接种量是0．3％～0．4％，pH为8，处理时间为36小时，处理温度取自然温度(室温)，经正交实验最佳组合为B3A3C1，即最佳的温度为30℃，最佳接种量为0．5％，最佳pH为5。处理后COD从20000mg／L降至1000mg／L左右，经高分子絮凝剂处理最佳的pH为8.／10000的絮凝剂聚丙烯酸钠加量为0．75～1．0mL／250mL废液，沉降时间为1．5～2．0h，主要污染指标COD降低到了350mg／L，达到了国家排放标准(≤350mg／L)。 相似文献