[Objective]The paper was to study the effects of nine kinds of household vase solutions on fresh-keeping effect of Lilium cut flowers.[Method]Using Lilium"Sorbonne"as the material,nine kinds of household vas...[Objective]The paper was to study the effects of nine kinds of household vase solutions on fresh-keeping effect of Lilium cut flowers.[Method]Using Lilium"Sorbonne"as the material,nine kinds of household vase solutions were prepared by edible white granulated sugar,white vinegar,akafen powder and vitamin C tablets,respectively.The morphological and physiological indexes of Lilium cut flowers,including vase life,ornamental grade,flower diameter,fresh weight of flower branches,water balance value,soluble protein content and MDA content of petals,were observed,and the effects of nine kinds of household vase solutions on fresh-keeping effect of Lilium cut flowers were studied.[Result]The household vase solution F8(20 g/L white granated sugar+1 packet/L acafen powder+2 tablets/L vitamin C tablets)had the best fresh-keeping effect on Lilium cut flowers,which was beneficial to prolong the vase life and improve the ornamental value of Lilium cut flowers.[Conclusion]The household vase solution of Lilium cut flowers is optimized,which is not only environmentally friendly but also convenient for ordinary families.展开更多
Using sucrose, citric acid and vitamin C as the basic liquid, different concentrations of 6-BA and B9 preservatives were added, and the carnation variety ＇ Master＇ was treated. The results showed that the formula of...Using sucrose, citric acid and vitamin C as the basic liquid, different concentrations of 6-BA and B9 preservatives were added, and the carnation variety ＇ Master＇ was treated. The results showed that the formula of 3% sucrose ＋ 50 mg/L citric acid ＋ 600 mg/L vitamin C ＋ 20 mg/L 6-BA could effectively maintain the water balance of the cut flower, prolong the vase life of the cut flower to 16.4 d, and maximize the flower diameter and the crown height.展开更多
The vitamin C rich-kiwi fruit-the king of fruits-is good to taste but hard to store. Only a few countries can prevent mildew on the fruit stalk during the storage process. The fresh-keeping technology developed by the...The vitamin C rich-kiwi fruit-the king of fruits-is good to taste but hard to store. Only a few countries can prevent mildew on the fruit stalk during the storage process. The fresh-keeping technology developed by the Shaanxi Teachers University has enabled China to catch up with the advanced countries in this field.展开更多
Objective:The purpose of the study was to evaluate listening effort in adults who experience varied annoyance towards noise.Materials and methods:Fifty native Kannada-speaking adults aged 41e68 years participated.We e...Objective:The purpose of the study was to evaluate listening effort in adults who experience varied annoyance towards noise.Materials and methods:Fifty native Kannada-speaking adults aged 41e68 years participated.We evaluated the participant's acceptable noise level while listening to speech.Further,a sentence-final wordidentification and recall test at 0 dB SNR(less favorable condition)and 4 dB SNR(relatively favorable condition)was used to assess listening effort.The repeat and recall scores were obtained for each condition.Results:The regression model revealed that the listening effort increased by 0.6%at 0 dB SNR and by 0.5%at 4 dB SNR with every one-year advancement in age.Listening effort increased by 0.9%at 0 dB SNR and by 0.7%at 4 dB SNR with every one dB change in the value of Acceptable Noise Level(ANL).At 0 dB SNR and 4 dB SNR,a moderate and mild negative correlation was noted respectively between listening effort and annoyance towards noise when the factor age was controlled.Conclusion:Listening effort increases with age,and its effect is more in less favorable than in relatively favorable conditions.However,if the annoyance towards noise was controlled,the impact of age on listening effort was reduced.Listening effort correlated with the level of annoyance once the age effect was controlled.Furthermore,the listening effort was predicted from the ANL to a moderate degree.展开更多
In project management,effective cost estimation is one of the most cru-cial activities to efficiently manage resources by predicting the required cost to fulfill a given task.However,finding the best estimation results i...In project management,effective cost estimation is one of the most cru-cial activities to efficiently manage resources by predicting the required cost to fulfill a given task.However,finding the best estimation results in software devel-opment is challenging.Thus,accurate estimation of software development efforts is always a concern for many companies.In this paper,we proposed a novel soft-ware development effort estimation model based both on constructive cost model II(COCOMO II)and the artificial neural network(ANN).An artificial neural net-work enhances the COCOMO model,and the value of the baseline effort constant A is calibrated to use it in the proposed model equation.Three state-of-the-art publicly available datasets are used for experiments.The backpropagation feed-forward procedure used a training set by iteratively processing and training a neural network.The proposed model is tested on the test set.The estimated effort is compared with the actual effort value.Experimental results show that the effort estimated by the proposed model is very close to the real effort,thus enhanced the reliability and improving the software effort estimation accuracy.展开更多
网络直播广告作为一种新型营销方式快速发展,优化直播广告运营主体努力水平及定价策略是一项值得深入研究的课题。本文基于广告投放效果的两种定价模式,构建了包含两个广告商和一个主播的网络直播广告定价决策模型,探索广告商与主播的...网络直播广告作为一种新型营销方式快速发展,优化直播广告运营主体努力水平及定价策略是一项值得深入研究的课题。本文基于广告投放效果的两种定价模式,构建了包含两个广告商和一个主播的网络直播广告定价决策模型,探索广告商与主播的最优努力水平选择及广告定价策略。研究发现:CPW(cost per watch)定价模式下,广告商承担了消费者是否购买的不确定性风险,当消费者敏感性系数偏低时,广告商会提交较低的出价,且B/D两类广告商赢得竞拍的概率相等;对比CPW模式,在CPA(cost per action)定价模式下广告商的努力水平更低,且CPA定价模式中B型(品牌型)广告商赢得竞拍的概率更大,但赢得竞拍的广告商边际利润往往较低;与广告商相反,主播在CPA定价模式下的收益大于CPW,且随消费者敏感性系数的增加,两种定价模式下的收益差逐渐增大;CPW定价模式下预期观看直播的用户量和购买率均高于CPA,网络直播市场倾向于从CPW广告定价合同中获得较大收益。展开更多
目的探究言语刺激强度对健听者听配能的影响。方法选取38例健听成人,采用语速x刺激强度的言语理解测试范式,将瞳孔扩张听配能测量和听觉任务完成准确度及反应速度相结合,观察阈上范围内20 dB SPL的强度变化对听配能和任务表现的影响。...目的探究言语刺激强度对健听者听配能的影响。方法选取38例健听成人,采用语速x刺激强度的言语理解测试范式,将瞳孔扩张听配能测量和听觉任务完成准确度及反应速度相结合,观察阈上范围内20 dB SPL的强度变化对听配能和任务表现的影响。结果语速对平均瞳孔扩张有显著影响(P<0.001,η_(p)^(2)=0.618),但刺激强度对平均瞳孔扩张无显著影响(P=0.213,η_(p)^(2)=0.040)。增加言语刺激强度能够显著提升任务反应速度(P=0.043,η_(p)^(2)=0.099),在正常语速下,还能够显著提升言语理解准确度(P<0.001,η_(p)^(2)=0.374)。结论健听人群听觉舒适阈范围内将言语声刺激强度增加20 dB SPL能够提高聆听效率,但该效应可能并不是通过改变可听度或唤醒度,从而影响听配能结果,可能是改变听觉处理速度。展开更多
目的通过主动模拟肺(ASL5000)模拟吸气努力,评价肌肉压力指数(pressure muscle index,PMI)与反映吸气努力水平指标包括吸气肌肉呼吸做功比例(percent of inspiratory muscle work of breathing,WOBmus%)和吸气肌肉压力-时间积分比例(per...目的通过主动模拟肺(ASL5000)模拟吸气努力,评价肌肉压力指数(pressure muscle index,PMI)与反映吸气努力水平指标包括吸气肌肉呼吸做功比例(percent of inspiratory muscle work of breathing,WOBmus%)和吸气肌肉压力-时间积分比例(percent of inspiratory muscle pressure time product,PTPmus%)之间的相关性。方法基于ASL5000平台进行实验设计,模拟50个不同肺模型参数以及25个不同的压力支持(pressure support,PS)水平,共模拟1250例具有不同自主呼吸水平的患者。通过软件对采集到的流速、气道压和食道压-时间波形数据进行线下分析。使用Spearman相关性分析对PMI和WOBmus%、PTPmus%进行分析。结果不同PMI分组患者之间的PS水平、WOBmus%和PTPmus%差异均有统计学意义。并且随着PMI数值增加,PS水平以及驱动压力逐步下降,呼吸机做功也随之减小。PMI与WOBmus%的Spearman相关系数为0.874(P<0.001),PMI与PTPmus%的Spearman相关系数为0.875(P<0.001)。结论PMI与WOBmus%、PTPmus%之间具有良好相关性,PMI可能是指导PS水平设置的一种无创、有效的指标。关于PMI在不同临床情境下的适用性,及其指导PS水平设置的有效性,未来需要更多的研究进行调查。展开更多
文摘[Objective]The paper was to study the effects of nine kinds of household vase solutions on fresh-keeping effect of Lilium cut flowers.[Method]Using Lilium"Sorbonne"as the material,nine kinds of household vase solutions were prepared by edible white granulated sugar,white vinegar,akafen powder and vitamin C tablets,respectively.The morphological and physiological indexes of Lilium cut flowers,including vase life,ornamental grade,flower diameter,fresh weight of flower branches,water balance value,soluble protein content and MDA content of petals,were observed,and the effects of nine kinds of household vase solutions on fresh-keeping effect of Lilium cut flowers were studied.[Result]The household vase solution F8(20 g/L white granated sugar+1 packet/L acafen powder+2 tablets/L vitamin C tablets)had the best fresh-keeping effect on Lilium cut flowers,which was beneficial to prolong the vase life and improve the ornamental value of Lilium cut flowers.[Conclusion]The household vase solution of Lilium cut flowers is optimized,which is not only environmentally friendly but also convenient for ordinary families.
文摘Using sucrose, citric acid and vitamin C as the basic liquid, different concentrations of 6-BA and B9 preservatives were added, and the carnation variety ＇ Master＇ was treated. The results showed that the formula of 3% sucrose ＋ 50 mg/L citric acid ＋ 600 mg/L vitamin C ＋ 20 mg/L 6-BA could effectively maintain the water balance of the cut flower, prolong the vase life of the cut flower to 16.4 d, and maximize the flower diameter and the crown height.
文摘The vitamin C rich-kiwi fruit-the king of fruits-is good to taste but hard to store. Only a few countries can prevent mildew on the fruit stalk during the storage process. The fresh-keeping technology developed by the Shaanxi Teachers University has enabled China to catch up with the advanced countries in this field.
文摘Objective:The purpose of the study was to evaluate listening effort in adults who experience varied annoyance towards noise.Materials and methods:Fifty native Kannada-speaking adults aged 41e68 years participated.We evaluated the participant's acceptable noise level while listening to speech.Further,a sentence-final wordidentification and recall test at 0 dB SNR(less favorable condition)and 4 dB SNR(relatively favorable condition)was used to assess listening effort.The repeat and recall scores were obtained for each condition.Results:The regression model revealed that the listening effort increased by 0.6%at 0 dB SNR and by 0.5%at 4 dB SNR with every one-year advancement in age.Listening effort increased by 0.9%at 0 dB SNR and by 0.7%at 4 dB SNR with every one dB change in the value of Acceptable Noise Level(ANL).At 0 dB SNR and 4 dB SNR,a moderate and mild negative correlation was noted respectively between listening effort and annoyance towards noise when the factor age was controlled.Conclusion:Listening effort increases with age,and its effect is more in less favorable than in relatively favorable conditions.However,if the annoyance towards noise was controlled,the impact of age on listening effort was reduced.Listening effort correlated with the level of annoyance once the age effect was controlled.Furthermore,the listening effort was predicted from the ANL to a moderate degree.
基金This work was supported by the Technology development Program of MSS[No.S3033853].
文摘In project management,effective cost estimation is one of the most cru-cial activities to efficiently manage resources by predicting the required cost to fulfill a given task.However,finding the best estimation results in software devel-opment is challenging.Thus,accurate estimation of software development efforts is always a concern for many companies.In this paper,we proposed a novel soft-ware development effort estimation model based both on constructive cost model II(COCOMO II)and the artificial neural network(ANN).An artificial neural net-work enhances the COCOMO model,and the value of the baseline effort constant A is calibrated to use it in the proposed model equation.Three state-of-the-art publicly available datasets are used for experiments.The backpropagation feed-forward procedure used a training set by iteratively processing and training a neural network.The proposed model is tested on the test set.The estimated effort is compared with the actual effort value.Experimental results show that the effort estimated by the proposed model is very close to the real effort,thus enhanced the reliability and improving the software effort estimation accuracy.
文摘网络直播广告作为一种新型营销方式快速发展,优化直播广告运营主体努力水平及定价策略是一项值得深入研究的课题。本文基于广告投放效果的两种定价模式,构建了包含两个广告商和一个主播的网络直播广告定价决策模型,探索广告商与主播的最优努力水平选择及广告定价策略。研究发现:CPW(cost per watch)定价模式下,广告商承担了消费者是否购买的不确定性风险,当消费者敏感性系数偏低时,广告商会提交较低的出价,且B/D两类广告商赢得竞拍的概率相等;对比CPW模式,在CPA(cost per action)定价模式下广告商的努力水平更低,且CPA定价模式中B型(品牌型)广告商赢得竞拍的概率更大,但赢得竞拍的广告商边际利润往往较低;与广告商相反,主播在CPA定价模式下的收益大于CPW,且随消费者敏感性系数的增加,两种定价模式下的收益差逐渐增大;CPW定价模式下预期观看直播的用户量和购买率均高于CPA,网络直播市场倾向于从CPW广告定价合同中获得较大收益。
文摘目的探究言语刺激强度对健听者听配能的影响。方法选取38例健听成人,采用语速x刺激强度的言语理解测试范式,将瞳孔扩张听配能测量和听觉任务完成准确度及反应速度相结合,观察阈上范围内20 dB SPL的强度变化对听配能和任务表现的影响。结果语速对平均瞳孔扩张有显著影响(P<0.001,η_(p)^(2)=0.618),但刺激强度对平均瞳孔扩张无显著影响(P=0.213,η_(p)^(2)=0.040)。增加言语刺激强度能够显著提升任务反应速度(P=0.043,η_(p)^(2)=0.099),在正常语速下,还能够显著提升言语理解准确度(P<0.001,η_(p)^(2)=0.374)。结论健听人群听觉舒适阈范围内将言语声刺激强度增加20 dB SPL能够提高聆听效率,但该效应可能并不是通过改变可听度或唤醒度,从而影响听配能结果,可能是改变听觉处理速度。
文摘目的通过主动模拟肺(ASL5000)模拟吸气努力,评价肌肉压力指数(pressure muscle index,PMI)与反映吸气努力水平指标包括吸气肌肉呼吸做功比例(percent of inspiratory muscle work of breathing,WOBmus%)和吸气肌肉压力-时间积分比例(percent of inspiratory muscle pressure time product,PTPmus%)之间的相关性。方法基于ASL5000平台进行实验设计,模拟50个不同肺模型参数以及25个不同的压力支持(pressure support,PS)水平,共模拟1250例具有不同自主呼吸水平的患者。通过软件对采集到的流速、气道压和食道压-时间波形数据进行线下分析。使用Spearman相关性分析对PMI和WOBmus%、PTPmus%进行分析。结果不同PMI分组患者之间的PS水平、WOBmus%和PTPmus%差异均有统计学意义。并且随着PMI数值增加,PS水平以及驱动压力逐步下降,呼吸机做功也随之减小。PMI与WOBmus%的Spearman相关系数为0.874(P<0.001),PMI与PTPmus%的Spearman相关系数为0.875(P<0.001)。结论PMI与WOBmus%、PTPmus%之间具有良好相关性,PMI可能是指导PS水平设置的一种无创、有效的指标。关于PMI在不同临床情境下的适用性,及其指导PS水平设置的有效性,未来需要更多的研究进行调查。
