共查询到20条相似文献,搜索用时 31 毫秒
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《Journal of voice》2022,36(4):585.e27-585.e37
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采用流化床反应器以水蒸气作为气化介质,以K2CO3修饰后的铁矿石作载氧体,进行煤化学链燃烧还原试验。结果表明,钾基铁矿石对水煤气反应及CO变换反应有明显的催化效果,大大提高反应速率,缩短反应平衡时间,有利于提高CO2体积份额。随着载氧体中K2CO3负载量由0%增加到20%,碳转化平衡时间逐步缩短,煤在58 min内的碳转化率呈逐渐增加趋势,CO2体积份额呈先增大后减小趋势,在6%K2CO3负载量时达到最大值。SEM结果显示钾基铁矿石表面呈一定烧结状态,铁矿石中K2CO3负载量不宜过高。 相似文献
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Journal of Statistical Physics - We study the large-time behavior of continuum alignment dynamics based on Cucker–Smale (CS)-type interactions which involve short-range kernels, that is,... 相似文献
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Homogeneous isotropic, anisotropic, and inhomogeneous cosmological models are studied using Einstein's general relativity with quntum corrections in field theoretical approximation. In particular we discuss coherent scalar fields and curvature squared terms in the gravitational Lagrangian. The conformal equivalence of the field equations of fourth order to general relativity with a scalar field as source is an example of the geometrization of a matter field. The aemiclassical quantum eorrections of the scalar fields can avoid the initial cosmological singularity and they lead to an inflationary evolution stage as transient attrator. The review provides new points of view on questions like the probability of the inflationary stage and the question of mechanisms for multiple inflation. 相似文献
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Nadine P. Connor Stacy B. Cohen Shannon M. Theis Susan L. Thibeault Diane G. Heatley Diane M. Bless 《Journal of voice》2008,22(2):197-209
SUMMARY: Because voice disorders in childhood may have a negative impact on communicative effectiveness, social development, and self-esteem, the objective was to determine the impact of voice disorders on lives of children from the perspective of chronically dysphonic children and their parents. This study consisted of focused interviews with chronically dysphonic children and their caregivers. Focused interviews were conducted with 10 children in each of the following age groups: Toddler (2-4 years old), Young Child (5-7 years old), School-Aged Child (8-12 years old), and Adolescent (13-18 years old). Interview questions were formulated to elicit attitudes in the following conceptual domains: emotional, social/functional, and physical. Interviews were transcribed and subjected to systematic qualitative analyses that identified common themes within each age group for each conceptual domain. For Toddlers, interviews relied heavily on parents and the biggest concerns were found in the physical and functional domains. Young Children expressed that their biggest issues related to voice were physical ("run out of air," "sometimes voice does not work"). Ninety percent of Young Children were repeatedly asked to use a quieter voice. Emotional factors and physical factors were prominent in the interviews of School-Aged Children and Adolescents. Children and Adolescents often felt that their dysphonic voice received undue attention and also limited their participation in important events. Anger, sadness, and frustration were also expressed. Chronic dysphonia negatively affects the lives of children. This work will serve as the basis for development of a valid, reliable, and age-appropriate measure of voice-related quality of life in children. 相似文献
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Anjan Biswas 《International Journal of Theoretical Physics》2010,49(1):79-83
This paper obtains the exact 1-soliton solution to the chiral nonlinear Schrödinger’s equation with time-dependent coefficients. Both bright and dark soliton solutions are obtained. The soliton ansatz method is used to carry out the derivation of the soliton. 相似文献
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基于近红外的Fisher分类法识别茶叶原料品种的研究 总被引:4,自引:0,他引:4
提出一种可对成品茶的原料品种进行准确识别的方法.在实验中对不同原料品种(龙井43#与其他品种)制成的茶叶样本进行近红外光谱的采集,通过主成分分析(principal component analysis,PCA)后获得了20个主成分,利用逐步回归法筛选出8个主成分作为自变量,建立茶叶原料品种的Fisher识别甬数对成品茶的原料品种进行识别分析.实验结果表明建立的识别函数能很好地对茶叶的原料品种进行准确识别,在定标集中的识别准确率达到了96.8%,并且利用外部样本进行验证的识别准确率也达到了93.5%.本实验证实了利用PCA和Fisher识别组合分析识别成品茶原料品种的可行性. 相似文献
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Some quaternary ammonium salts and isonitriles are examined by 13C NMR. A Fermi-Contact type of correlation is suggested as a basis for estimation of the effect of lone pairs, alkyl substitution and π-bonding on JNC 相似文献
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Leonard S. Kisslinger 《International Journal of Theoretical Physics》2016,55(10):4462-4468
This work estimates the probability of μ to e neutrino oscillation with two sterile neutrinos using a 5×5 U-matrix, an extension of the previous estimate with one sterile neutrino and a 4×4 U-matrix. The sterile neutrino-active neutrino mass differences and the mixing angles of the two sterile neutrinos with the three active neutrinos are taken from recent publications, and the oscillation probability for one sterile neutrino is compared to the previous estimate. 相似文献
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给定物体三刺激值,重建物体反射率在跨媒体颜色复制领域有着重要应用.常见的重建反射率算法包括基向量法、维纳估计法、加权伪逆方法等,这些方法大多都是为了建立由低维度三刺激值或者RGB向高维度光谱反射率的映射关系,以重建的反射率与原始反射率的接近程度为评价指标,并且需要光谱反射率数据进行训练.但是很多工业领域在产品设计时都需... 相似文献