检索结果-南通市图书馆

Mechanical Harvesting Effects on Seed Yield Loss,Quality Traits and Profitability of Winter Oilseed Rape (Brassica napus L.)

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2012年第8期11卷 1297-1304页

作者： MA Ni ZHANG Chun-lei li Jun ZHANG ming-hai CHENG Yu-gui li guang-ming ZHANG Shu-jie Oil Crops Research Institute Chinese Academy of Agricultural Sciences/Key Laboratory of Oil Crop Biology Ministry of Agriculture/Key Laboratory of Crop Cultivation and Physiology Ministry of Agriculture Wuhan 430062 PR.China Agricultural Institute of Yichang City Yichang 443004 P.R.China

China is one of the most important rapeseed producing countries in the world. Effective mechanical harvesting time for decreasing harvesting loss of winter oilseed rape has been becoming a critical factor. An elite cultivar Zhongshuang 11 （Brassica napus L.） was employed in two rounds of field experiments from 2009 to 2011. Seeds were sown with machine, three combine harvesting times namely combine harvesting A, B, and C （CHA, CHB, and CHC） were designed and manual harvesting （MH） as control was performed at maturity. The harvesting treatments were determined according to color of pod and seed in the field. Seed yield loss and quality in different treatments were evaluated. Results showed that both seed yields and harvesting losses in 2009-2010 were higher than that in 2010-2011, whereas seed oil contents in 2010-2011 were higher than that in 2009-2010. The highest yield appeared in CHB, which was significantly higher than that in MH. Furthermore, harvesting loss in CHB were 50% that in MH. Seed oil content and chlorophyll exhibited no obvious difference between CHB and MH. Economic profit analysis demonstrated that mechanical sowing/combine harvesting （MS/CH） showed an input/output ratio of 1：1.6, and it was 1：1.2 in mechanical sowing/manual harvesting （MS/MH）. Labor-cost accounted for more than 70% of the total cost in MS/MH, which led to low profitability to a great extent. Our results suggested that CHB was the optimum harvesting time for winter oilseed rape along the Yangtze River.

关键词： winter oilseed rape (Brassica napus L.) combine harvesting harvesting loss seed quality economic profit

组合沉拔桩施工方法在船坞续改建工程中的应用

在线全文

学校读者我要写书评

暂无评论

建筑技术 2024年第9期55卷 1097-1100页

作者：杨连佼许光亮詹景元李明广中交第三航务工程局有限公司上海分公司上海200030 上海交通大学船舶海洋与建筑工程学院上海200240

在船坞续改建工程中,若能将原坞墙结构中的CAZ组合钢板桩重复利用,则会大幅减少工程成本,带来可观的经济效益。因此,在保障施工质量的前提下,如何将既有坞墙结构的CAZ组合钢板桩拔出、加工、再打入设计标高位置处是船坞续改建施工中的... 详细信息

在船坞续改建工程中,若能将原坞墙结构中的CAZ组合钢板桩重复利用,则会大幅减少工程成本,带来可观的经济效益。因此,在保障施工质量的前提下,如何将既有坞墙结构的CAZ组合钢板桩拔出、加工、再打入设计标高位置处是船坞续改建施工中的一个重要问题。结合某船坞的续改建工程施工进行深入研究,详细介绍了使用组合沉拔桩施工方法进行既有坞墙组合钢板桩拔出、加工以及再打入土体的施工步骤,并针对提高施工速度和保障施工质量提出了措施建议。

关键词：船坞坞墙 CAZ组合钢板桩拔桩沉桩

Alcohols＇ Classification by Infrared Spectra Segment Based on Support Vector Machines

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第7期17卷 929-932页

作者： Wei XIE Fu Sheng NIE Meng Long li guang ming li Min Chun LU College of Chemistry Sichuan University Chengdu 610064

This paper studies various classifiers to identify primary, secondary or tertiary alcohols by using segmental spectra and their combinations to support vector machines （SVMs）. The results showed that the O-H in-plane bending absorption contributed most to identification their substitute. This conclusion disagrees with related known research results.

关键词： Infrared spectra alcohols support vector machine information extraction.

Effects of the Residues of Cuscuta campestris and Mikania micrantha on Subsequent Plant Germination and Early Growth

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2012年第11期11卷 1852-1860页

作者： li Feng-lan li ming-guang ZAN Qi-jie GUO Qiang ZHANG Wei-yin WU Zhi WANG Yong-jun State Key Laboratory of Biocontrol Sun Yat-sen University Guangzhou 510275 P.R.China Futian-CityU Mangrove Research & Development Centre Shenzhen 518040 P.R.China The Shenzhen Wild Animal Rescue Center Shenzhen 518000 P.R.China Office of Greening Committee of Shenzhen City Shenzhen 518048 P.R. China Laboratory of Forest Ecology and Environment State Forestry Administration Beijing 100714 P.R.China Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry Beijing 100091 P.R.China guangdong Neilingding-Futian National Nature Reserve Shenzhen 518040 P.R. China

Cuscuta campestris, a dodder, can parasitize and suppress a scrambling herbaceous to semi-woody perennial vine, Mikania micrantha, one of the most destructive weeds in the world. To assess the effects of the mixed residue of C. campestris and M. micrantha on the subsequent plant community, we conducted a one-year experiment on the germination and seedling growth of subsequent plant community after the application of C. campestris. Seven treatments of varying proportions of C. campestris and M. mierantha residue on 21 subject trees and shrubs, which were commonly found in South China, resulted in a germination rate of 35.3% for all 8 715 seeds from 18 species, ranging from 5.7 to 81.9%; the remaining 3 species failed to germinate. ANOVA analysis showed that the residue did not affect the germination, growth, or mortality of the trees and shrubs. The germinated C. campestris seeds from the residue coiled the seedlings of most of the species, but less than 4% host death caused by C. campestris. In addition, the residue did not affect the germination of the herbaceous seedlings originating from the loam, and the similarity coefficients of the germinated seedlings between the treatments were very high. These results suggested that the residue had no negative impact on the germination and early seedling stages of the tree, shrub and grass species of the subsequent plant community. The use of C. campestris residue had a positive effect on the growth of M. micrantha, but it did not change the trend of M. micrantha being suppressed because re-parasitization occurred soon after the growth restarted. No negative effect was detected on the other species as a result of the parasitization of C. campestris or by the use of the mixed residue. This suggests that C. campestris is likely to be an effective and promising ecologically safe native herbaceous agent for controlling M. micrantha.

关键词： invasive species parasitic plant control subsequent community

Overexpression of the OsPDCD5 Gene Induces Programmed Cell Death in Rice

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2005年第9期47卷 1115-1122页

作者： Kotb ATRIA Ke-Gui li Chun WEI guang-ming HE Wei SU Jin-Shui YANG Institute of Genetics School of Life Sciences Fudan University Shanghai 200433 China

The primary aim of the present study was to investigate the overexpression of the rice （Oryza sativa L.） programmed cell death 5 （OsPDCD5） gene in rice plant. Constitutive expression of OsPDCD5 from the cauliflower mosaic virus （CaMV） 35S promoter induced programmed cell death （PCD） in transgenic rice. Programmed cell death was accompanied by typical features, including inhibition of developmental growth, a reduction of fresh weight, degradation of total protein content, and fragmentation of genomic DNA. These results suggest that OsPDCD5 plays an essential role in the regulation of PCD in rice plants.

关键词： gene transformation Oryza sativa rice programmed cell death 5 (OsPDCD5) gene programmed cell death.

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

稀土对高强车轮钢夹杂物赋存特征的影响研究

稀土 2024年第2期45卷 57-65页

作者：刘军韩荣荣张波李明光苗隽刘宏亮刘承军本钢集团有限公司技术中心先进汽车用钢开发与应用技术国家地方联合工程实验室辽宁本溪117000 东北大学冶金学院辽宁沈阳110819

结合高温模拟实验和热力学分析,探讨了稀土对高强车轮钢中夹杂物类型及尺寸分布的影响,并与传统的钙处理钢进行了对比。研究结果表明,铝脱氧车轮钢经钙处理后夹杂物主要为Al_(2)O_(3)、MnS、(Mn,Ca)S和CaO-Al_(2)O_(3)以及Al_(2)O_(3)-(... 详细信息

结合高温模拟实验和热力学分析,探讨了稀土对高强车轮钢中夹杂物类型及尺寸分布的影响,并与传统的钙处理钢进行了对比。研究结果表明,铝脱氧车轮钢经钙处理后夹杂物主要为Al_(2)O_(3)、MnS、(Mn,Ca)S和CaO-Al_(2)O_(3)以及Al_(2)O_(3)-(Mn,Ca)S和CaO-Al_(2)O_(3)-CaS包裹型复合夹杂物;与钙处理钢对比,车轮钢经稀土处理后,钢中Al_(2)O_(3)夹杂物数量减少,MnS和(Ca,Mn)S夹杂物消失,生成了近球形的Ce_(2)O_(2)S、Ce_(2)O_(3)夹杂,夹杂物尺寸显著减小;随稀土含量的增加[w(Ce)=0.0160%~0.0250%],不大于5μm的夹杂物数量占比由91.0%提升至99.8%,稀土细化夹杂物效果显著。热力学分析表明:在1600℃条件下,随着车轮钢中w(Ce)由0增加至0.0300%,钢液中主要夹杂物类型的变化规律为Al_(2)O_(3)→CeAlO_(3)→Ce_(2)O_(3)→Ce_(2)O_(2)S。通过稀土处理可实现钢中Al_(2)O_(3)夹杂物的变质,并有效抑制凝固过程中MnS夹杂的生成,生成Ce_(2)O_(2)S、Ce_(2)O_(3)夹杂。

关键词：车轮钢稀土夹杂物热力学分析尺寸细化

高同型半胱氨酸血症对心血管病进程的加速作用

在线全文

学校读者我要写书评

暂无评论

生理科学进展 2024年第3期55卷 248-256页

作者：王淑美刘雅欣赵一桐任清照林凡琪李明光吉林医药学院检验学院吉林132013

同型半胱氨酸(homocysteine, Hcy)作为人体甲硫氨酸的代谢产物,其体内水平与多种疾病的发病相关。高同型半胱氨酸血症(hyperhomocysteinemia, HHcy)是全身动脉粥样硬化、心血管病(cardiovascular disease, CVD)以及中风发病的独立危险... 详细信息

同型半胱氨酸(homocysteine, Hcy)作为人体甲硫氨酸的代谢产物,其体内水平与多种疾病的发病相关。高同型半胱氨酸血症(hyperhomocysteinemia, HHcy)是全身动脉粥样硬化、心血管病(cardiovascular disease, CVD)以及中风发病的独立危险因素。Hcy诱导的炎症反应、脂代谢异常、凝血功能障碍等,将严重影响血管的正常结构与功能,从而加速动脉粥样硬化的进程。服用叶酸和B族维生素,可以有效降低HHcy患者血液Hcy水平。本文将围绕HHcy加速CVD进程的机制进行综述,从而为临床预防和治疗HHcy提供新思路。

关键词：同型半胱氨酸高同型半胱氨酸血症心血管病致病机制 H型高血压

Biodegradation of 2,6-ditert-butylphenol by immobilized microorga- nism strains

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第2期18卷 369-372页

作者： ZHANG Ya-lei ZHANG Zhi-gang XU De-qiang QIANG Zhi-min li guang-ming ZHAO Jian-fu Key Laboratory of Yangtze Water Environment of Ministry of Education Tongji University Shanghai 200092 China School of life Science Fudan University Shanghai 200433 China Department of Civil Architectural and Environmental Engineering University of Missouri-Rolla Rolla MO 65409 USA State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China

2,6-Ditert-butylphenol （2,6-DTBP） is a major organic contaminant presenting in acrylic fiber manufacturing wastewaters. This compound is of high bio-resistance due to its complex structure which consists of one phenol group and two highly branched tert-butyl groups. This research attempted to improve the biodegradation efficiency of 2,6-DTBP through various strain immobilization methods. The stratified immobilization can settle oxygen transmission in the single microorganism immobilization, and can realize two-process reaction in the single device by choosing two symbiotic microorganisms. Two effective strains, named F-1-4 and F-3-4, which were screened out in our previous work, were used to degrade 2,6-DTBP after being immobilized in calcium alginate gel. Results indicate that the substrate removal efficiency of various immobilization methods follows the order： stratified 〉 single F-3-4 〉 mixed ≈single F-1-4. The immobilized biodegradation capacity was higher than the free one. After an incubation time of 12 d, 91% of 2,6-DTBP could be degraded by the stratified immobilization method, compared to 79% achieved by the mixed immobilization method with an initial 2,6-DTBP concentration of 100 mg/L. The stratified immobilization satisfies the oxygen demand nature of the aerobic F-3-4 and the facultative F-1-4, thus yielding the highest degradation efficiency. Both the outer layer strain F-3-4 and the inner layer strain F-1-4 can grow actively on the substrate of 2,6-DTBP, as illustrated by SEM images. This study shows that the highly bio-refractory compound, 2,6-DTBP, can be effectively degraded using appropriately inunobilized microorganism strains.

关键词： biodegradation 2,6-ditert-butylphenol immobilization microorganism strains

Nitrogen interception in floodwater of rice field in Taihu region of China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第12期19卷 1474-1481页

作者： liANG Xin-qiang CHEN Ying-xu li Hua TIAN guang-ming ZHANG Zhi-jian NI Wu-zhong HE Miao-miao Department of Environmental Engineering College of Natural Resources and Environmental Science Zhejiang University Hangzhou 310029 China.

A field experiment located in Taihu Lake Basin of China was conducted, by application of urea or a mixture of urea with manure, to elucidate the interception of nitrogen （N） export in a typical rice field through ＂zero-drainage water management＂ combined with sound irrigation, rainfall forecasting and field drying. N concentrations in floodwater rapidly declined before the first event of field drying after three split fertilizations, and subsequently tended to rearm to the background level. Before the first field drying, total particulate nitrogen （TPN） was the predominant N form in floodwater of plots with no N input, dissolved inorganic nitrogen （DIN） on plots that received urea only, and dissolved organic nitrogen （DON） on plots treated with the mixture of urea and manure. Thereafter TPN became the major form. No N export was found from the rice field, but total nitrogen （TN） of 15.8 kg/hm^2 was remained, mainly due to soil N sorption. The results recommended the zero-drainage water management for full-scale areas for minimizing N export.

关键词： nitrogen paddy field surface floodwater interception Taihu region