简介：AbstractBackground and objective:Functional endoscopic sinus surgery (FESS) increases the nasal volume, and thereby it can alter the nasal resonance. The objectives were to measure the percentage of nasal resonance following FESS and compare it with healthy individuals with normal nasal findings.Methods:The nasometric analysis of voice was done using n/p/m consonant sounds in 72 individuals with healthy post FESS cavities (group 1) and 72 healthy individuals with normal nasal findings without any nasal pathology (group 2). The scores of nasal resonances were expressed in percentages and were compared between the two groups. Both in group 1 and group 2, 32 (44.4%) were females, and 40(55.6%) were males. In group 1, 51 participants had bilateral FESS cavities, and 21 had unilateral FESS cavities. Kannada was the mother tongue in 30 (41.7%) participants in group 1 and 36 (50.0%) in group 2. Malayalam was the mother tongue in 42(58.3%) participants in group 1 and 36 (50.0%) in group 2.Results:In both cases and control groups, more than 80% of the participants were showing less than 20% of nasal resonance. In group 1, the mean values of/n/p/m sounds were 11.23%, 10.23% and 11.42% respectively, and in group 2 the mean values were 8.27%, 8.58% and 8.58% respectively. But the P value was not statistically significant. Individuals with unilateral FESS cavities had more nasal resonance values compared to bilateral FESS cavities. Similarly, Kannada speaking people had more values compared to Malayam speaking individua.Conclusion:Changes in nasal resonance after FESS is minimal, and it is unnoticed. But it may affect the speech quality in professional voice users, depending on their language. Though the nasometer is considered as the most validated instrument to record nasal resonance, we feel that further standardization is needed to evaluate the nasalance.

简介：摘要：煤炭是中国的主要化石能源，也是许多重要化工品的主要原料，随着国家经济的发展，化工品的需求也出现较高的增长速度。煤化工在中国能源、化工领域中已占有重要地位。我国根据自身能源结构特点，实行以煤为主的能源政策。但是在利用煤炭的同时，将会产生大量的C02。本文就C02的产生与减排进行了相关探讨。

简介：摘要：本教学设计案例围绕 预备单元（Starter Unit 3What color is it ? ）展开。通过复习句型（What’s this/that? It’s an apple. What color is it? t’s red. Spell it ,please.It’s red）谈论物体颜色学习语法（an/a/the），同时训练学生听，说的能力 .本教学设计依据新课程标准要求，通过希沃游戏，大转盘游戏激发学生学习兴趣，采用图片直观教学法， 通过师生练习，小组练习，双人练习呈现新句型（It’s a red apple.The apple is red.），让学生观察发现总结 规律学习语法。通过完成听力任务培养学生抓住关键词寻找答案的听力技能，培养学生好的听力习惯 。同时以教材为本，结合实际，采用小组合作表演培养学生的口语技能和初步写作能力。本教学案例教学手段多样，使用希沃游戏教学，大转盘游戏，图片插入直观教学，图片裁剪，多媒体希沃白版5手机拍照视频上传，音乐剪辑插入播放等多种信息技术教学手段提高学生学习兴趣，调动学生积极性， 尽力让学生全体参与。教学过程中贯穿课程思政的理念，作业设计注重学生能力的培养。

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简介：【摘要】互联网技术的迅速发展与普及，推动着基础教育新课程改革，面对数字技术带来的全新教学模式，教师们与时俱进，在学习中尝试新的教育技术来提高教学效率，构建高效课堂取得了可喜成绩。美术学科作为美育教育的主要课程，在此大背景影响下，教改实践也取得了一些成效。本文围绕美术学科的教改尝试，从营造情境美、再现情境美、体验情境美、实践后的反思与体会四个方面，浅述互联网在初中美术课堂教学实践中发挥的作用。

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简介：摘要：空洞卷积也叫做膨胀卷积，或者扩张卷积。空洞卷积最初是为了解决图像分割的问题而提出的。在通用目标检测算法中，空洞卷积不仅能控制感受野和分辨率，还能有效地提升网络的感受野，在保持特征图不变的情况下，有效利用多尺度信息，继而能够提升算法的性能。

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简介：AbstractAvian influenza remains a threat to human wellbeing. Hypochlorite derivatives are commonly used as disinfectants to prevent the spread of the disease. The World Health Organization (WHO) has listed chlorine dioxide (ClO2) as an A1-level, safe, and efficient disinfectant. In this study, we tested the efficacy of ClO2, in aqueous solution and gas forms, against avian influenza A (H7N9) virus. The virus suspension was mixed with ClO2 aqueous solutions of various concentrations and for various time intervals. Aliquots of the mixture were then serially diluted, and the 50% tissue culture infective dose (TCID50) was measured with a hemagglutination test on MDCK cells. ClO2 gas produced from generators was introduced in a chamber containing the virus suspension in a Petri dish. The infective activity of the surviving virus was measured by the hemagglutination test. An aqueous solution of ClO2 at 126 µg/mL for 15 s was effective given that no surviving virus was detected with the hemagglutination test. ClO2 gas at >5 µL/L sustained for 1 h inactivated the virus effectively, while at 2.5 µL/L for 1 h, it only partially inactivated the virus. ClO2 as gas or aqueous solution at a certain concentration is effective in inactivating the H7N9 virus, and can be applied for the decontamination and disinfection of environments.

简介：摘要：我国社会经济在发展过程中，计算机技术得到了不断的创新，影视制作行业得到较大发展。其中，在进行影视后期制作的过程中，为了提高制作质量，需要采用After Effect软件，它在影视后期制作中有较大的应用效果。After Effect软件能够有效提升图形视频的处理质量，并且在此基础上可有效提高其制作质量，此外After Effect软件具有功能丰富、制作成本低等优点。所以，在对影视后期制作期间，制作者应对After Effect软件科学应用引起足够的重视，只有这样，才能有效提高影视后期制作质量，以此推动我国影视行业的较快发展，为提升我国影视行业在国际中的地位奠定良好的基础。

简介：摘要目的研究小檗碱对白血病耐药细胞株K562/A02阿霉素耐药性及蛋白激酶C-α（PRKCA）的影响，探讨其作用机制。方法体外培养人慢性粒细胞白血病K562细胞、阿霉素耐药株K562/A02，使用2.5~50.0 μmol/L的阿霉素处理，检测K562、K562/A02对阿霉素的耐药性，计算药物半抑制浓度（IC50）；采用终浓度5 μmol/L的阿霉素溶液处理K562/A02细胞，并将K562/A02细胞分为对照组、抑制剂组（50 μmol/L PRKCA抑制剂）及小檗碱低、中、高剂量组，采用细胞计数（CCK-8）法检测各组细胞增殖抑制率，通过流式细胞仪检测各组细胞凋亡情况，实时荧光定量PCR法检测PRKCA、多药耐药相关基因（MDR1）水平，Western blot法检测PRKCA、多药耐药相关蛋白（MRP）、P-糖蛋白（P-gp）表达情况。结果与K562比较，K562/A02对阿霉素的IC50升高（P<0.05）；与对照组比较，抑制剂组及小檗碱低、中、高剂量组细胞增殖抑制率、凋亡率升高（P<0.05），PRKCA mRNA［（0.45±0.08）、（0.92±0.10）、（0.57±0.05）、（0.35±0.04）比（1.00±0.12）］、MDR1 mRNA［（0.73±0.08）、（0.87±0.09）、（0.65±0.07）、（0.41±0.05）比（1.00±0.11）］及PRKCA蛋白［（0.59±0.09）、（0.78±0.12）、（0.61±0.11）、（0.42±0.07）比（0.96±0.14）］、MRP蛋白［（0.62±0.08）、（0.79±0.13）、（0.62±0.10）、（0.41±0.06）比（0.98±0.14）］、P-gp［（0.55±0.08）、（0.75±0.12）、（0.59±0.09）、（0.35±0.06）比（0.92±0.15）］表达降低（P<0.05），且小檗碱呈药物剂量依赖性（P<0.05）；过表达PRKCA可显著抑制小檗碱逆转K562/A02细胞耐药的作用。结论小檗碱可能通过下调PRKCA逆转人白血病耐药株K562/A02对阿霉素的耐药性。

简介：摘 要：思想政治工作是党的优良传统、鲜明特色和政治优势，是一切工作的生命线，在学习宣传贯彻党的路线方针政策、提高干部职工思想道德素质、服务企业改革发展等方面发挥着重要作用。传统国有煤炭企业具有自身鲜明特点，职工往往来自五湖四海，文化程度、道德修养、工作经历参差不齐；工作环境相对较为恶劣，安全威胁大、劳动强度大，往往远离市区、远离家庭，职工心理压力较大，迫切需要通过思想政治工作化解职工思想上的“疙瘩”、消除职工情绪上的“波动”，做好新时代职工队伍思想政治工作意义重大、责任重大。

简介：摘要：课堂教学是学校教学的主阵地，是教师立身之本，也是学生获得知识技能的主战场，课堂效率的高低是衡量教师及学校教学质量优劣的重要标尺，而互动式的课堂教学将为教学质量提升添彩赋能。

简介：AbstractObjective:The majority of non-small cell lung cancer (NSCLC) cases remain undiagnosed until advanced stages of the disease. Accumulating studies have highlighted the utility of palliative care as an effective treatment option, which relieves patients’ suffering by activating placebo effect in the body. To evaluate the clinical significance of palliative care, data from NSCLC drug-randomized controlled trials (RCTs) were collected and the effects of placebo treatment examined.Methods:PubMed (MEDLINE), Scopus, Web of Science, and China National Knowledge Infrastructure databases were searched from January 1,1978 to September 1,2020. Placebo-controlled phase II/III pharmaceutical RCTs enrolling patients with solely stage III/IV NSCLC were included. The quality of included studies was assessed using the Jadad method. Single-arm and two-arm meta-analyses of the therapeutic and adverse effects of placebo, that is, the primary and secondary outcome measures, were subsequently performed using either Bayesian or conventional models.Results:Five RCTs including 2245 drug-treated and 1510 placebo-treated patients at NSCLC stage III or IV were included for the study. Low risk of bias was observed for all five included studies using the Cochrane method. Following placebo treatment, controlled disease rate of 24.1% (95% credible interval [CrI], -0.126-0.609) and dropout rate of 2.1% (95% CrI, 0.007-0.039) were calculated, with a dose reduction rate of 3.0% (95% CrI, 0.017-0.045). Compared with active drug treatment, the placebo treatment group had a risk ratio of 0.81 (95% confidence interval, 0.68-0.97) and 0.85 (95% confidence interval, 0.76-0.96) for the achievement of progression-free survival and overall survival, respectively.Conclusion:In NSCLC drug RCTs, placebo treatment is indicated to generally induce low toxicity in patients by dropout and dose reduction rates and adverse events, although the therapeutic responses could not be precisely determined. The results suggest that under specific circumstances, palliative care which can activate placebo effect may have similar effects as active drugs (such as erlotinib, vandetanib, or pemetrexed) in terms of prolonging survival time.

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简介：AbstractN-acetyl-cysteine (NAC) is an efficacious treatment for sensorineural hearing loss in animal models, such as noise-induced hearing loss (NIHL), however previous research into the effect of NAC on patients with hearing loss produced contradictory results. In this study, we investigated the effect of NAC treatment on sensorineural hearing loss. PubMed, Web of Science and Embase databases were searched in their entirety using the key words: hearing loss, NAC, N-acetylcysteine, and sensorineural hearing loss. Studies which included assessment of hearing loss with pure-tone threshold (PTA) data were selected. Eligible studies regarding the effects of NAC treatment on patients with hearing loss were collected by two independent reviewers. A total of 1197 individuals were included from seven published studies. Two studies reported data for a sudden idiopathic sensorineural hearing loss (SISNHL) group. Three studies reported data for a NIHL group. Other studies reported data for drug-induced hearing loss. The meta-analysis demonstrated that the overall effect of NAC treatment on sensorineural hearing loss was invalid. However, NAC treatment was linked with improved patient outcomes of hearing tests in cases of sudden hearing loss, but did not prevent hearing loss induced by noise or ototoxicity. However, there is a need for better-designed studies with larger samples to further prove the correlation between the effect of NAC and hearing loss.