检索结果-南通市图书馆

Preparation and Testing of Cementing and Coating Nano-Subnanocomposites of Slow/Controlled-Release Fertilizer

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

Agricultural Sciences in China 2006年第9期5卷 700-706页

作者： LIU Xiu-mei FENG Zhao-bin ZHANG Fu-dao ZHANG Shu-qing he xu-sheng Soil and Fertilizer Institute Jiangxi Academy of Agricultural Sciences Nanchang 330200 P.R China Soil and Fertilizer Institute Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

To select the cementing and coating materials of slow/controlled-release fertilizer, the natural kaoline and abandoned foam plastics were used to prepare nano-subnanocomposites through the methods of organic material intercalation, semiemulsification, and cut at high velocity techniques. Besides, two kinds of nano-subnanocomposites were tested in this study using several instruments, including the scanning electron microscope （SEM）, the X-ray diffraction （XRD）, the infrared ray spectrum （IR）, and the laser granularity. The main results were as follows： 1） The organic material was intercalated in the layers of kaoline clays, and the natural kaoline exfoliated into nanometer-sized layers. The organic agent and clays formed nanocomposites through hydrogen bond combination. 2） The SEM pictures of polystyrenestarch nano-subnanocomposites showed that many pores and rugas were present on the surface of film at sizes ranging from 10 to 20 nm. These nano-subnanocomposites were used as the cementing and coating materials of slow/controlledrelease fertilizer.

关键词： nano-subnanocomposites preparation testing

Characteristics and Performance of Novel Water-Absorbent Slow Release Nitrogen Fertilizers

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2007年第3期6卷 338-346页

作者： he xu-sheng LIAO Zong-wen HUANG Pei-zhao DUAN Ji-xian GE Ren-shan LI Hong-bo GENG Zeng-chao Postdoctorate Exchange Centre for Plant Protection South China Agricultural University Guangzhou 510642 P.R.China Enterprise Postdoctorate Centre for Batian Eco-Engineering Co. Shenzhen 518105 P.R.China College of Resources and Environment Science Northwest A＆F University Yangling 712100 P.R.China

In this article, a research on the characteristics and performance of water-absorbent slow release nitrogen fertilizer （WASRNF） using infrared spectroscopy （IR）, scanning electronic microscopy （SEM）, differential scanning calorimetry （DSC）, and thermogravimetry analysis （TGA）, was present. The results indicate that the water absorbency and nitrogen analysis of WASRNF is 103 g g^-1 and 30%, respectively, and WASRNF exhibits approximately neutral pH and very low salt index. WASRNF is a copolymer of nitrogen fertilizer and super absorbent polymer （SAP） monomers which is formed through hydrogen bond interaction, and the molecule contains hydrophilic groups, which is responsible for the absorption and water retention capacity of the molecule. WASRNF is a gel that exhibits the ability to swell, but does not dissolve in water. WASRNF shows non-homogenous nature as a whole, but in local zone it is homogenous, the copolymer molecule shows chain network that is the physical structure responsible for absorption and retention of water in WASRNF. The water retained in WASRNF exists as free and nonfreezing bound and freezing bound water states, with the free and the nonfreezing water accounting for more than 95% of water retained in WASRNF, and the nonfreezing bound water for less than 5%. WASRNF functions in delaying the release of nitrogen from it, thereby serving a novel slow release nitrogenous fertilizer.

关键词： water-absorbent slow release nitrogen fertilizer characteristics performance

在线全文

学校读者我要写书评

暂无评论

保水缓释钙肥的特征与性能

干旱地区农业研究 2017年第1期35卷 85-90页

作者：何绪生耿增超西北农林科技大学资源环境学院陕西杨凌712100

采用化学聚合反应将保水剂与硝酸钙聚合为一体化物质,并以吸水倍率、p H值、土壤水分特征曲线、元素分析、红外光谱、电子显微镜及7 d溶出率法表征保水钙肥的吸水持水能力、化学性质、形貌结构及养分释放性能。结果表明:保水缓释吸水倍... 详细信息

采用化学聚合反应将保水剂与硝酸钙聚合为一体化物质,并以吸水倍率、p H值、土壤水分特征曲线、元素分析、红外光谱、电子显微镜及7 d溶出率法表征保水钙肥的吸水持水能力、化学性质、形貌结构及养分释放性能。结果表明:保水缓释吸水倍率约为165 g·g-1,含钙量为103 g·kg-1,p H值近中性;保水剂通过化学键结合,基质包埋负载钙盐;网络孔隙及基质是保水钙肥吸水保水的物理结构;与对照相比,保水钙肥添加量为1%时,在测试吸力段可增加土壤容积含水量平均14.0%。此外,保水钙肥显示较好的钙素养分延缓释放性能,可将钙素较长时间保持在水凝胶基质内而延长水溶性钙有效期。

关键词：保水钙肥化学聚合特征性能

在线全文

学校读者我要写书评

暂无评论

保水剂包膜尿素的特征与性能

植物营养与肥料学报 2005年第3期11卷 334-339页

作者：何绪生张夫道中国农业科学院土壤肥料研究所

保水肥料是缓/控释肥料研究的新方向,本文利用聚合化学反应制备出了一种保水剂包膜尿素肥料,并对该肥料的包膜特征、养分控释性能及其对土壤水分的影响进行了研究。结果表明:保水剂包膜尿素的实际包膜量低于设计包膜量,一般低10%～12%... 详细信息

保水肥料是缓/控释肥料研究的新方向,本文利用聚合化学反应制备出了一种保水剂包膜尿素肥料,并对该肥料的包膜特征、养分控释性能及其对土壤水分的影响进行了研究。结果表明:保水剂包膜尿素的实际包膜量低于设计包膜量,一般低10%～12%。扫描电镜成像图显示:保水剂包膜尿素包膜上存在纤维网状孔隙,膜厚度为0 15～0 25mm。7d水溶出率的实验结果表明,保水剂包膜尿素养分控释效果低于塑料包膜尿素,保水剂包膜尿素的养分缓释作用主要来自包膜对尿素的吸附作用。保水剂包膜尿素处理土壤的土壤水分脱水曲线测定结果说明,保水剂包膜尿素可提高土壤水分含量,增加土壤水分的有效性,改善土壤的保水、释水性能。因此,保水剂包膜尿素肥料是具有开发应用前景的新型缓/控释肥料。

关键词：保水剂包膜尿素特征评价

在线全文

学校读者我要写书评

暂无评论

社区矫正与刑事法的修改完善

辽宁大学学报（哲学社会科学版） 2012年第6期40卷 25-30页

作者：单勇徐荷生浙江工业大学法学院浙江杭州310023 浙江省丽水市人民检察院浙江丽水323000

随着社区矫正制度由局部试点到全国推广,社区矫正工作已出现了从政策到法律的嬗变趋势;而循序渐进和稳妥严谨的立法模式是社区矫正立法更为科学、可行的选择,即从刑法、刑诉法的附属性规范以及部门规章进化到独立且系统的《社区矫正法... 详细信息

随着社区矫正制度由局部试点到全国推广,社区矫正工作已出现了从政策到法律的嬗变趋势;而循序渐进和稳妥严谨的立法模式是社区矫正立法更为科学、可行的选择,即从刑法、刑诉法的附属性规范以及部门规章进化到独立且系统的《社区矫正法》。基于法治精神和人权原则,刑事法律修改与未来《社区矫正法》制定的重心不能仅停留在将刑事执行权合理分配到各矫正机构,而应特别关注如何科学设置各种机制进而保障矫正机构合法履行刑事执行权,尤其是应重视社区治理,促成社区矫正从"在社区内矫正"到"依靠社区的矫正"的根本转变。

关键词：社区矫正刑法修改社区矫正法社区治理

在线全文

学校读者我要写书评

暂无评论

保水剂作为肥料养分缓释载体的应用

中国土壤与肥料 2008年第4期 5-9页

作者：何绪生何养生邹绍文西北农林科技大学资环学院陕西杨凌712100 陕西省周至县第一中学陕西周至710400 江西省土壤肥料技术推广站江西南昌330046

保水缓/控释肥料是具有吸水、保水及释水的新型缓/控释肥料,其对改善水肥效率具有良好的前景。保水缓/控释肥料的开发应用技术关键是研究开发可作为肥料载体材料的低成本新型保水剂材料。保水剂在性能上应具备吸水倍率高,吸水速率适宜,... 详细信息

保水缓/控释肥料是具有吸水、保水及释水的新型缓/控释肥料,其对改善水肥效率具有良好的前景。保水缓/控释肥料的开发应用技术关键是研究开发可作为肥料载体材料的低成本新型保水剂材料。保水剂在性能上应具备吸水倍率高,吸水速率适宜,耐盐性好的优点;保水剂对肥料的吸附容量及其与肥料的化学结合性也是保水剂实际应用应考察的重要性能。不同类型的保水剂对肥料显示不同的吸附及化学结合特征,保水剂与肥料复合可以是物理、化学或物理化学的作用机制。保水剂可以通过物理包埋,物理、化学吸附、氢键、离子键及共价键结合、复合肥料养分。今后应加强新型廉价高效保水剂材料及其与肥料复合机制的研究。

关键词：保水剂保水缓/控释肥料复合技术方向

在线全文

学校读者我要写书评

暂无评论

一种基于混沌搜索的文化算法及其应用

计算机应用研究 2010年第7期27卷 2472-2475页

作者：何建佳徐福缘何胜学黄鹤上海理工大学管理学院上海200093

针对文化算法求解函数优化问题存在过早收敛、不稳定等缺陷,基于文化算法框架、嵌入混沌搜索优化,提出了一种混沌文化算法。该算法模型由基于混沌的群体空间和存储知识的信念空间组成,利用标准知识和形势知识分别引导混沌搜索和混沌扰动... 详细信息

针对文化算法求解函数优化问题存在过早收敛、不稳定等缺陷,基于文化算法框架、嵌入混沌搜索优化,提出了一种混沌文化算法。该算法模型由基于混沌的群体空间和存储知识的信念空间组成,利用标准知识和形势知识分别引导混沌搜索和混沌扰动,有效克服了文化算法过早收敛、混沌搜索优化对初值敏感、搜索效率低等缺陷。实例表明,该方法具有较强的全局搜索能力,在搜索效率、精度和稳定性上有显著表现,并能有效处理高维函数优化问题。

关键词：进化计算文化算法混沌文化算法混沌搜索知识引导

Overview of in-situ oxygen production technologies for lunar resources

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 233-255页

作者： Youpeng xu sheng Pang Liangwei Cong Guoyu Qian Dong Wang Laishi Li Yusheng Wu Zhi Wang College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial ***,crucial for supporting human life on the Moon,can be extracted from lunar regolith,which is highly rich in oxygen and contains polymetallic *** oxygen and metal extraction can be achieved using existing metallurgical ***,the ample reserves of water ice on the Moon offer another means for oxygen *** paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon,drawing from an analysis of lunar resources and environmental *** delves into the principles,processes,advantages,and drawbacks of water-ice electrolysis,two-step oxygen production from lunar regolith,and one-step oxygen production from lunar *** two-step methods involve hydrogen reduction,carbothermal reduction,and hydrometallurgy,while the one-step methods encompass fluorination/chlorination,high-temperature decomposition,molten salt electrolysis,and molten regolith electrolysis(MOE).Following a thorough comparison of raw materials,equipment,technology,and economic viability,MOE is identified as the most promising approach for future in-situ oxygen production on the *** the corrosion characteristics of molten lunar regolith at high temperatures,along with the Moon's low-gravity environment,the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the *** review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

关键词： lunar resources in-situ oxygen production space metallurgy molten lunar regolith electrolysis

Comparison of Grain Quality Characteristics Between F_1 Hybrids and Their Parents in Indica Hybrid Rice

在线全文

学校读者我要写书评

暂无评论

Rice science 2003年第1期10卷 16-22页

作者： LIAO Fu-ming, ZHOU Kun-lu, YANG he-hua, xu Qiu-sheng (China National Hybrid Rice Research and Developmental Center, Changsha 410125, China) China National Hybrid Rice Research and Developmental Center Changsha 410125 China

Sixteen widespread elite indica parents including seven CMS lines and nine restorer lines, and their 63 F_1 hybrids were chosen to compare the eleven traits of grain quality. Overall results showed that the frequency of negative over-dominance, dominance and partial dominance was much higher than that of positive ones and heterosis, indicating that the values of F_1 hybrids were generally lower than the means of their parents in quality characteristics. There existed apparent disparity in grain quality performance among F_1 hybrids varied with the traits. The characteristics of chalky area percentage, chalky grain percentage, gel consistency and head rice recovery had a great variation in all kinds of tested heterosis indices including the mid-parent heterosis index, over high-value parent heterosis index and over low-value parent heterosis index, which suggested that special attention should be paid to the selection of F_1 hybrids in these traits in breeding. The mean values of F_1 hybrids were significantly lower than those of their higher parents in all the traits but close to or significantly lower than those of their mid-parent values except for kernel length and amylose content; and significantly higher than those of their lower parents except for brown rice recovery, milled rice recovery and gel consistency.

关键词： hybrid rice indiea rice grain quality traits relative heterosis heterosis index