检索结果-南通市图书馆

Infrared thin layer drying of saffron(Crocus sativus L.) stigmas:Mass transfer parameters and quality assessment

Chinese Journal of Chemical Engineering 2017年第4期25卷 426-432页

作者： mehdi torki-harchegani Davoud Ghanbarian Vida Maghsoodi Ahmad Moheb Young Researchers and Elite Club Shahrekord BranchIslamic Azad University Department of Mechanical Engineering of Biosystems Shahrekord University Department of Chemical and Petroleum Engineering Sharif University of Technology Department of Chemical Engineering Isfahan University of Technology

Saffron is the most precious and expensive agricultural product. A dehydration treatment is necessary to convert Crocus sativus L. stigmas into saffron spice. To the best of our knowledge, no information on mass transfer parameters of saffron stigmas is available in the literature. This study aimed at investigating the moisture transfer parameters and quality attributes of saffron stigmas under infrared treatment at different temperatures(60,70, …, 110 °C). It was observed that the dehydration process of the samples occurred in a short accelerating rate period at the start followed by a falling rate period. The effective moisture diffusivity and convective mass transfer coefficient were determined by using the Dincer and Dost model. The diffusivity values varied from1.1103 × 10^(-10)m^2·s^(-1)to 4.1397 × 10^(-10)m^2·s^(-1) and mass transfer coefficient varied in the range of 2.6433 × 10^(-7)–8.7203 × 10^(-7)m·s^(-1). The activation energy was obtained to be 27.86 k J·mol^(-1). The quality assessment results showed that the total crocin content increased, when the temperature increased up to90 °C but, in higher temperatures, the amount of crocin decreased slightly. The total safranal content of the samples decreased slightly when drying temperature increased from 60 °C to 70 °C and then continuously increased up to 110 °C. Also, the amount of picrocrocin increased from 83.1 to 93.3 as the drying temperature increased from 60 °C to 100 °C.

关键词：藏花红外线的弄干有效扩散性集体转移系数化学作文

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of type, level and time of sand and gravel mining on particle size distributions of suspended sediment

引用

International Soil and Water Conservation Research 2018年第2期6卷 184-193页

作者： Seyed Hamidreza Sadeghi Sudabeh Gharemahmudli Hossein Kheirfam Abdulvahed Khaledi Darvishan Mahboobeh Kiani harchegani Pari Saeidi Leila Gholami mehdi Vafakhah Department of Watershed Management Engineering Faculty of Natural ResourcesTarbiat Modares UniversityNoor***Mazandaran ProvinceIran Department of Environmental Sciences Urmia Lake Research InstituteUrmia UniversityUrmiaIran Department of Watershed Management Engineering Faculty of Natural ResourcesTarbiat Modares UniversityNoor46417-76489Iran Department of Range and Watershed Management Sari Agriculture and Natural Resources UniversitySariMazandaran ProvinceIran

Monitoring the sediment transport behavior induced by different interventions, particularly sand mining from rivers, is needed to adaptively manage the watersheds. The particle size distribution of the sus-pended sediment in up and downstream of rivers is one of the main indicators to know about fate of sediments, which may be varied in different conditions. We investigated the effect of some types of sand and gravel (i.e., manual and low, semi-heavy, and heavy machinery) mining on particle size distribution of suspended sediment in the Vaz-e-Owlya, Vaz-e-Sofla and Alesh-Roud riverine mines located in Ma-zandaran Province, northern Iran. The study was conducted on a monthly basis from February, 2012 to January, 2013. Laser granulometry was used to analyze the particle size distribution of suspended se-diment samples taken from up and downstream sections of the study mines. The results revealed that the level and intensity of mining activity affected particle size distribution of suspended sediments. Further statistical assessments in up and downstream sections of the mines proved that sorting, D50, mean, D90, kurtosis, skewness and D10 of the suspended sediment were not significantly influenced by mining activities at levels of 0.09, 0.11, 0.12, 0.15 to 0.69, 0.15–0.69, 0.77, 0.87, 0.97, respectively. While it was not statistically significant, we found that the type of mine and the level of the exploitation changed the particle size distribution of the suspended sediment.

关键词： Mine exploitation Particle size distribution Sediment granulometry Sediment temporal variations

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green coffee bean hydroalcoholic extract accelerates wound healing in full-thickness wounds in rabbits

引用

Traditional Medicine Research 2020年第6期5卷 433-441页

作者： Reza Shahriari Pari Tamri Amir Larki harchegani Alireza Nourian Department of Pharmacology&Toxicology School of PharmacyMedicinal Plants and Natural Products Research CenterHamadan University of Medical SciencesHamadan ***Iran Department of Laboratory Sciences Faculty of Para-Veterinary SciencesBu-Ali Sina UniversityHamadan ***Iran

Background:Green coffee beans contain biochemical compounds including caffeine,chlorogenic acid,trigonelline,and diterpenoid *** traditional Iranian medicine,coffee bean powder is used for the treatment of *** studies have shown that green coffee bean extract has a number of health benefits,including induction of weight loss,reduced blood pressure,and hepatoprotective and anti-Parkinson *** aim of this study was to investigate the wound-healing activity of green coffee bean extract on a full-thickness wound ***:Full-thickness wounds of 20×20 mm were created on the back of New Zealand white *** animals were divided into 6 *** concentrations of green coffee bean extract(5%,10%,and 15%w/w)in a eucerin base were applied over the wounds in 3 test *** percent phenytoin cream was used in one group as a positive *** rabbits of negative control and vehicle groups received no treatment and eucerin,*** the evaluation of green coffee bean extract’s wound-healing effects,measures included:(1)wound-closure rate,by daily measuring of the wound surface area and calculating the reduction in area;(2)period of epithelialization,the number of days until the scab dropped from the wound;(3)hydroxyproline content,measured by a hydroxyproline assay kit;(4)lipid peroxidation,measured by a lipid peroxidation assay kit;and(5)histopathological state(hematoxylin-eosin stain)of wound-tissue samples on days 7 and 14 ***:The results of this study showed significantly enhanced wound-closure rate,shorter period of epithelialization(P<0.01),increased hydroxyproline content(P<0.001)and suppressed lipid peroxidation(P<0.001 on day 14)of wounds on animals treated with the 10%green coffee bean extract compared to the negative control and eucerin-treated ***,the therapeutic effects of 10%green coffee bean were significantly superior than those of phenytoin on enhancing wound-closure rate,decrea

关键词： Green coffee bean Green coffee bean extract Wound healing Epithelialization Hydroxyproline Histopathology

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Refining Soil Organic Matter Determination by Loss-on-Ignition

引用

Pedosphere 2011年第4期21卷 473-482页

作者： M.H.SALEHI O.HASHEMI BENI H.BEIGI harchegani I.ESFANDIARPOUR BORUJENI H.R.MOTAGHIAN Department of Soil Science College of AgricultureShahrekord University Department of Soil Science College of AgricultureVali-e-Asr University

Wet oxidation procedure,i.e.,Walkley-Black (WB) method,is a routine,relatively accurate,and popular method for the determination of soil organic matter (SOM) but it is time-consuming,costly and also has a high potential to cause environmental pollution because of disposal of chromium and strong acids used in this ***,loss-on-ignition (LOI) procedure,a simple and cheap method for SOM estimation,which also avoids chromic acid wastes,deserves more *** aims of this research were to study the statistical relationships between SOM determined with the LOI (SOMLOI) and WB (SOMWB) methods to compare the spatial variability of SOM in two major plains,Shahrekord and Koohrang plains,of Chaharmahal-va-Bakhtiari Province,*** surface soil samples (0-25 cm) were randomly collected in each plain to determine SOM using the WB method and the LOI procedure at 300,360,400,500 and 550 ℃ for 2 *** samples covered wide ranges of soil texture and calcium carbonate equivalent (CCE).The general linear form of the regression equation was calculated to estimate SOM LOI from SOM obtained by the WB method for both overall samples and individual *** soil samples were also randomly selected to compare the SOM and CCE before and after ignition at each *** accuracy of the continuous maps generated for the LOI and WB methods was considered to determine the accordance of two *** showed a significant positive linear relationship between SOM LOI and SOM *** of determination (R2) of the equations for individual plains were higher than that of the overall *** of determination and line slopes decreased and root mean square error (RMSE) increased with increasing ignition temperature,which may be due to the mineral structural water loss and destruction of carbonates at higher temperatures.A temperature around 360 ℃ was identified as optimum as it burnt most organic carbon,destroyed less inorganic carbon,cau

关键词：土壤有机质点火温度测定亏损线性回归方程精炼平均平方误差 SOM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：