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Complete laryngeal atresia is a rare congenital malformation that is known to cause hypertrophy of the fetal lung in utero. A fetus with laryngeal atresia was found to have markedly immature amniotic fluid lung maturity studies at term. Inappropriately low amniotic fluid lung maturity studies may be an important clue to the diagnosis of this condition. 相似文献
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Two premature triplet pregnancies underwent repeated treatment aimed at acceleration of individual fetal lung maturity while administering intravenous tocolytic treatment. From the early third trimester, repeated amniocenteses were used for intra-amniotic administration of thyroxine to each sac, while the individual fetal lung maturation rate was determined by surfactant microviscosity until lung maturity was achieved. 相似文献
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Steffi Mayer Philipp Klaritsch Scott Petersen Elisa Done Inga Sandaite Holger Till Filip Claus Jan A. Deprest 《黑龙江环境通报》2011,31(11):1086-1096
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污泥高温好氧堆肥的实验研究 总被引:1,自引:0,他引:1
城市污水污泥(简称污泥)含有丰富的N、P、K元素及有机质,同时还含有难降解有机物、重金属、病原菌等有害有毒物质,若不加以妥善处理便会造成严重的环境污染,并通过食物链危机人类健康,同时又是资源的极大浪费.本实验针对西北地区污泥特性,采用两阶段高温好氧堆肥工艺,用玉米芯、粉煤灰和麦草做添加剂,将实验堆肥物料的有机质含量调整到50%左右,含水率调整到60%左右,一次发酵采用温度-通风量联合自动控制,二次发酵采用自然通风、翻堆的方式,探讨了不同粒径的玉米芯粒经对污泥堆肥过程中的温度、含水率、有机质、硝态氮等参数的变化影响,以及对堆肥效果的影响.结果表明,添加玉米芯、粉煤灰等添加剂,可使污泥减量化、无害化,并且能够制得肥分较高的堆肥产品. 相似文献
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对脱水污泥与4种填充料进行了好氧堆肥试验,温度、含水率、有机质、pH和电导率等参数的监测表明堆肥过程能顺利进行.通过研究化学指标水溶性有机碳、NO-3-N、NH+4-N及生物学指标Cress发芽指数CI(Germina-tion Index)随时间的变化规律,发现NH+4-N是影响生物学参数Cress发芽结果的重要因素,其含量变化与GI间具有较好的相关关系.本文提出NH+4-N作为本堆肥工艺的腐熟度评价指标,腐熟堆肥的NH+4-N含量范围为0.5~1.4mg/g,其变化与初始堆料有关. 相似文献
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Jillian Coolen Barbra Bradshaw Ravi Bhargava Gordon Lees Nestor Demianczuk 《黑龙江环境通报》2007,27(1):73-76
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采用气相色谱、色谱-质谱、同位素、红外光谱等方法,分析了长北油田原油的来源、母质类型的成熟度的高低。研究结果表明.本区原油具有同源性,母质为陆相沉积腐殖型,原油生成于浅湖相弱还原环境中,热演化处于低成熟-成熟过程。 相似文献
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Prakesh S. Shah Susan Blaser Ants Toi Katherine Fong Phyllis Glanc Riyana Babul-Hirji James Rutka David Chitayat 《黑龙江环境通报》2005,25(7):539-542
We describe the finding of cavum veli interpositi (CVI) on fetal ultrasound and MRI and the postnatal MRI and developmental follow-up in two cases. The first case was diagnosed on fetal ultrasound at 33 weeks' gestation and confirmed on fetal MRI. No abnormalities were detected on postnatal examinations and the brain MRI at 1 year of age showed no changes. At 4 years of age, his growth and development were normal. The second case was diagnosed with CVI on fetal ultrasound and MRI at 33.5 weeks' gestation. Postnatal examination showed no abnormalities, and brain MRI at 8 months of age revealed that the CVI was unchanged, but there was a dilated cavum septum pellucidum and cavum vergae. Her growth and development during the first 4 years of life were normal. CVI is a rare fetal ultrasound finding, which seems to be benign. However, further neurodevelopmental follow-up is needed to confirm this observation. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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壳幔二元混合模计算结果的意义是多解的。对该模型所获得的“壳幔比”,并不象一些研究者所认为并强调的那样具有定量意义。所以,将f_M视为岩浆形成时地幔物质直接参与的质量比是不正确的;实质上,它只能被用来定性地反映岩浆源区岩石的成熟程度。 相似文献
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IntroductionDiffusionmaybethedominantmasstransfermechanism(comparedtoadvection)inporousmediaoflowpermeabilitywhicharewidelyusedasnaturalorartificialbarriersforpollutioncontrolatwastedisposalsites.Diffusiontransportofcontaminantsthroughclay,silt,mudrock… 相似文献
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IntroductionInrecentyears,intensiveanimalproductionhasresultedinhighdensityofanimalsinsmallareas,producinglargequantitiesofwastewithinsufficientnearbylandforapplication .InHongKong ,thepigindustryhasseenasteadygrowthinrecentyears .Itresultedinindiscrimin… 相似文献
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不同物料堆肥腐熟度评价指标的变化特性 总被引:21,自引:0,他引:21
为探讨工厂化好氧堆肥的堆肥周期及腐熟度评价体系,提高工厂堆肥效率,选取上海地区不同来源典型的9种物料,采用工厂化工艺进行堆肥试验,对堆体的温度、含水率、pH、C/N、w(OM)、ρ(NH4+-N)、ρ(NO3--N)、ρ(DOC)、ρ(DOC)/ρ(DON)及GI(种子发芽指数)腐熟度评价指标变化规律进行研究. 结果表明:堆肥腐熟度受多方面因素影响,T〔(C/N)终点/(C/N)起点)〕与w(OM)、ρ(NH4+-N)、GI、ρ(DOC)/ρ(DON)之间相关性显著,T、ρ(NH4+-N)、GI 3个指标能准确有效地判断堆肥腐熟情况,堆肥结束后T在0.50~0.59之间,ρ(NH4+-N)为301~346 mg/L,GI为81.31%~91.03%. 不同物料堆肥腐熟难易程度不同,通过聚类分析将9种物料分为5类:第1类,厨余、杂草、生活垃圾、园林垃圾;第2类,果蔬、污泥;第3类,秸秆;第4类,鸡粪;第5类,猪粪. 厨余、杂草、生活垃圾、园林垃圾、污泥、秸秆堆肥成分复杂较难腐熟,需要35 d达到腐熟标准;鸡粪及猪粪堆肥结构简单较易腐熟,29 d即可达到腐熟标准. 据此可适当将工厂化堆肥周期缩短为35 d. 相似文献
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为了探讨木薯加工废弃物堆肥化中氰化物的降解速度和快速处理效果,将木薯皮、木薯渣与猪粪混合制作堆肥,通过发酵过程中温度、pH、氰化物、纤维素、半纤维素、木质素及碳氮比等的测定,评价了堆肥化过程对氰化物无害化处理的效果及堆肥的腐熟进程.结果表明,氰化物含量迅速降低,30 d后达到2.08 mg/kg,分解率达到94.16%,符合食品安全标准.堆制材料中淀粉、纤维素、半纤维素等主要含碳成分及氰化物在15 d内分解,分解率达80%以上,基本趋于稳定.经过30 d的堆肥化过程,堆体温度也回落至常温,趋于稳定,pH一直稳定在7.2.堆体中碳氮比(C/N)、硝态氮(NO-3-N)、铵态氮(NH+4-N)等腐熟度判定指标数据也表明,木薯加工废弃物经过15 d的堆肥化过程,堆体内各种理化性质稳定,在发酵结束时,C/N为17.55,硝态氮和铵态氮的含量分别达到了2.5 g/kg和10 mg/kg,NO-3-N/NH+4-N的比值为250,全部达到腐熟标准.证明木薯加工废弃物经30d堆肥化处理可达到稳定安全状态. 相似文献