A novel method to estimate changes in stress-induced salivary α-amylase using heart rate variability and respiratory rate,as measured in a non-contact manner using a single radar attached to the back of a chair

The authors have developed a non-contact system which estimates changes in salivary α-amylase (sAA ratio) induced by stress. Before and after stressful sound exposure, a single 24?GHz compact radar which is attached to the back of a chair measures the low frequency (LF) component of heart rate variability and respiratory rate, α-amylase in the subjects’ buccal secretions was measured by using an α-amylase assay kit. Using multiple regression analysis, sAA ratio was estimated using stress-induced LF change (LF ratio) and stress-induced respiratory rate change (respiratory rate ratio). Twelve healthy subjects were tested (12 males, 22?±?2 years), who were exposed to audio stimuli with a composite tone of 2120?Hz and 2130?Hz sine waves at a sound pressure level of 95?dB after a silent period through a headphone. The result showed that sAA ratio estimated using multiple regression analysis significantly correlated with measured sAA ratio (R?=?0.76, p?相似文献   

Transurethral microwave thermotherapy for benign prostatic hyperplasia: Relation between clinical response and prostate histology

The effectiveness of transurethral microwave thermotherapy (TUMT) for BPH has been confirmed. To identify the characteristics of the ideal candidate, retrospective analysis and morphometric study of prostatic tissue were performed. Forty-two patients with symptomatic BPH were included in the study; these comprised 10 patients treated for more than 3 months with anti-androgen pre-TUMT (group A) and 32 fresh cases (group B). Subjective and objective responses were evaluated at 2 months post TUMT. In 12 fresh cases who underwent pre-TUMT biopsy of the prostate, the stromal-to-epithelial ratio was determined via quantitative image analysis on a computer-assisted morphometry system. No significant differences in baseline patient characteristics were found between the two groups: age, prostate volume, peak flow rate (PFR), or International Prostate Symptom Score (I-PSS). However, significant differences in treatment outcome were found between the two groups (group A vs. group B, respectively): total energy delivered to the prostate: 96 kJ vs. 125 kJ; I-PSS decrease from baseline: 5.9 vs. 11.6; PFR increase from baseline: 1.1 vs. 4.7 ml/sec. There was a positive correlation between the I-PSS change from baseline and the stromal-to-epithelial ratio of the prostatic tissue (r = 0.4857). The results suggest that microwave interacts poorly with the prostate due to the artificially created “lack” of glandular tissue. The morphometric study also supports the contention that the histological composition of the prostatic tissue plays an important role in terms of microwave thermal interactions and treatment outcome. © 1996 Wiley-Liss, Inc.     

Microstructure and Mechanical Properties of Novel Lightweight TaNbVTi-Based Refractory High Entropy Alloys

A series of novel lightweight TaNbVTi-based refractory high entropy alloys (RHEA) were fabricated through ball-milling and spark plasma sintering (SPS). The reinforced phase of TiO precipitates were in-situ formed due to the introduction of Al₂O₃ ceramic particles. The RHEA with 15% Al₂O₃ exhibits a high compressive yield strength (1837 MPa) and a low density (7.75 g/cm³) with an adequate ductility retention. The yield strength and density are 32% higher and 15% lower, respectively, compared to the RHEA without Al₂O₃ addition. The specific yield strength (237 MPa cm³/g) of the RHEAs is much higher than that of other reported RHEAs, and is mainly ascribed to the introduction of high volume fraction of Al₂O₃ additives, resulting in solid solution strengthening and precipitation strengthening. Meanwhile, the ductile matrix is responsible for the good compressive plasticity.     

Microwave-Assisted Hydrothermal Synthesis of Zinc-Aluminum Spinel ZnAl2O4

The drawback of the hydrothermal technique is driven by the fact that it is a time-consuming operation, which greatly impedes its commercial application. To overcome this issue, conventional hydrothermal synthesis can be improved by the implementation of microwaves, which should result in enhanced process kinetics and, at the same time, pure-phase and homogeneous products. In this study, nanometric zinc aluminate (ZnAl₂O₄) with a spinel structure was obtained by a hydrothermal method using microwave reactor. The average ZnAl₂O₄ crystallite grain size was calculated from the broadening of XRD lines. In addition, BET analysis was performed to further characterize the as-synthesized particles. The synthesized materials were also subjected to microscopic SEM and TEM observations. Based on the obtained results, we concluded that the grain sizes were in the range of 6–8 nm. The surface areas measured for the samples from the microwave reactor were 215 and 278 m² g⁻¹.     

正交设计考察不同干燥方法对桔梗质量的影响

目的确立桔梗的产地加工的干燥工艺。方法以药典方法并结合其他方法测定桔梗的出干率、总皂苷与水溶性浸出物的含量。结果桔梗采集后,洗净,以微波3min或80℃烘干较好,尤以微波干燥其出干率、桔梗总皂苷、水浸出物含量最高。结论通过微波干燥所得的桔梗饮片其桔梗总皂苷的含量明显高于晒干法,降低劳动强度,是一种值得研究和推广的干燥方法。     

曲妥珠单抗联合微波热疗治疗HER-2阳性晚期乳腺癌的临床疗效分析

目的:探讨曲妥珠单抗联合微波热疗治疗HER-2阳性晚期乳腺癌患者的临床疗效。方法:选取我院2018年1月至2018年12月收治的HER-2阳性晚期乳腺癌患者54例,按随机表法分为治疗组与对照组,每组27例。两组均采用曲妥珠单抗治疗,治疗组同时给予微波热疗。比较两组患者免疫功能、循环肿瘤细胞（CTCs）、生存质量、近期疗效、总生存期及不良反应情况。结果:治疗组免疫功能和生存质量提高（P<0.05）,CTCs数量下降（P<0.05）;治疗组近期疗效及总生存期优于对照组（P<0.05）;两组不良反应发生率比较差异无统计学意义（P>0.05）。结论:曲妥珠单抗联合微波热疗治疗HER-2阳性晚期乳腺癌患者具有良好的临床疗效且安全性较高。     

微波法处理有机实验室废水的研究

采用微波催化氧化处理有机实验室废水,探讨了微波功率等因素对有机实验室废水处理效果的影响,获得了最佳工艺条件为:100 mL COD为4 632 mg/L的废水(初始pH=3)在微波功率为800 W下,辐射10 min,粉煤灰4 g,30%H2O2 1 mL,FeSO4 0.08 g的条件下,COD去除率达91.5%.