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全光纤微型土壤水分含量传感器 被引量:2
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作者 王佳敏 李振 王纪强 《红外与激光工程》 EI CSCD 北大核心 2022年第3期376-381,共6页
基于掺杂光纤光热转换效应和光纤光栅测温原理研发了一种全光纤微型土壤水分含量传感器。利用1 480 nm泵浦激光对埋设在土壤中的掺钴光纤加热,同时利用刻写在掺钴光纤上的布拉格光栅测定其温度变化,根据加热过程中温度特征值与含水率之... 基于掺杂光纤光热转换效应和光纤光栅测温原理研发了一种全光纤微型土壤水分含量传感器。利用1 480 nm泵浦激光对埋设在土壤中的掺钴光纤加热,同时利用刻写在掺钴光纤上的布拉格光栅测定其温度变化,根据加热过程中温度特征值与含水率之间存在的线性关系实现土壤水分含量的原位测量。为了验证该方法的可行性和传感器准确度,搭建了土壤水分含量测试平台并进行实验,实验表明温度特征值与土壤含水率之间存在线性关系;且研发的全光纤微型土壤水分含量传感器所测土壤含水率与烘干法有较好的一致性,最大误差-1.41%,明显优于电导率法。这种新型的土壤水分含量测量方法具有微型化、低功耗的特点。 展开更多
关键词 光纤土壤水分含量传感器 光热转换 原位测量
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四川省主要农作物秸秆理化特性 被引量:1
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作者 余满江 蒋昭琼 +2 位作者 熊昌国 庹洪章 易文裕 《江苏农业科学》 北大核心 2017年第13期213-218,共6页
为研究四川省主要农作物秸秆的特性,在四川省平原区、丘陵区、山区采集50个麦秸、油菜秸、稻秸、玉米秸样本,并对其相关理化特性进行测试;探讨粉碎长度对秸秆物理特性的影响,比较不同地区麦秸、油菜秸的理化特性,研究秸秆理化特性的种... 为研究四川省主要农作物秸秆的特性,在四川省平原区、丘陵区、山区采集50个麦秸、油菜秸、稻秸、玉米秸样本,并对其相关理化特性进行测试;探讨粉碎长度对秸秆物理特性的影响,比较不同地区麦秸、油菜秸的理化特性,研究秸秆理化特性的种类差异性。结果显示,粉碎长度对秸秆的自然堆积密度和振实堆积密度有显著性影响,粉碎长度较大的秸秆样品的静态堆积角、自然堆积密度、振实堆积密度离散程度较大;作物种类对秸秆的静态堆积角、自然堆积密度、振实堆积密度、全水分含量、干燥基灰分含量、绝干弹筒热值有显著性影响,在麦秸、油菜秸、稻秸、玉米秸4种农作物秸秆中,油菜秸最适宜作秸秆燃料,稻秸最差。 展开更多
关键词 四川省 秸秆 堆积角 堆积密度 全水分含量 干燥基灰分含量 热值
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煤炭筛分试验技术探讨 被引量:2
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作者 孟娟 梁艳 《科技与生活》 2011年第8期157-157,共1页
煤炭筛分试验是测定煤炭粒度组成和各粒级质量的一种基本方法,通过筛分试验可为合理利用煤炭和制定煤炭产品质量标准提出重要依据,也是设计筛选厂的依据,还可以用来指导生产。鉴于此,本文结合笔者多年从事煤炭化验实践经验,探讨如... 煤炭筛分试验是测定煤炭粒度组成和各粒级质量的一种基本方法,通过筛分试验可为合理利用煤炭和制定煤炭产品质量标准提出重要依据,也是设计筛选厂的依据,还可以用来指导生产。鉴于此,本文结合笔者多年从事煤炭化验实践经验,探讨如何准确进行煤炭筛分试验,提出正确的方法,以及相关化验技术要点,为同行人员提供参考借鉴。 展开更多
关键词 煤炭化验 水分测定 水分测定 全水分含量
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Relevance of Dried Meat Product (Kundi), an Intermediate Moisture Meat, for Food Security
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作者 P. O. Fakolade 《Journal of Agricultural Science and Technology(A)》 2011年第4X期563-569,共7页
The main goal of food security is for individual to be able to obtain adequate and quality food needed at all times, and to utilise the food to meet the body needs. Kundi is a relish Intermediate Moisture Meat (dried... The main goal of food security is for individual to be able to obtain adequate and quality food needed at all times, and to utilise the food to meet the body needs. Kundi is a relish Intermediate Moisture Meat (dried meat) product, produced in the Northern part of Nigeria. 2-3 years old male Camelus dromedarius and White Fulani animals were used for this study, 2 kg of semimembranous muscles from each animal were used, and trimmed of all external fat, connective tissues and bones. Meat samples were cut in sizeable pieces of weight ranges 70-90 grams of 6-8 cm and kept in the refrigerator for 24 hours. Fresh meat cuts were boiled for 20 minutes at 100 ~C, seasoned and oven dried for 3 hours at 170 ~C. This study assessed the proximate composition of fresh and dried meat (Kundi) products and their sensory evaluation in a completely randomized design. The results showed that fresh camel meat had 74.55% and 21.96% significantly (P 〈 0.05) higher in moisture and protein content than 72.69% and 18.96% of fresh beef, while fresh beef had higher (P 〈 0.05) ether extract (6.34%) than fresh camel meat (2.39%). Laboratory Prepared Beef Kundi (LPBK) had the highest (P 〈 0.05) value in moisture content 35.09% followed by Laboratory Prepared Camel 'Kundi' (LPCK) with 33.21% while Commercial Kundi (CK) had the least. Protein obtained was inversely proportionally to moisture content. Ether extract for LPCK and LPBK were statistically similar (P 〉 0.05) and both were lower (P 〈 0.05) than value obtained for CK. The results obtained for sensory evaluation showed that the panelist rated seasoned Kundi to have the highest significant (P 〈 0.05) valve for tenderness, flavour, colour, juiciness, texture and acceptability with values 6.50, 5.30, 6.50, 6.53, 6.30 and 7.00 respectively. Study showed that dry meat products (Kundi) is of high nutritional qualities, and could be of a great relevance; to food security. 展开更多
关键词 Kundi BEEF CAMEL seasoned and unseasoned kundi.
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