检索结果-南通市图书馆

Estimation of Turnover and Equilibrium of Soil Organic Matter Using a Mathematical Approach

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2006年第5期16卷 634-645页

作者： wu chun-Yan CHEN yi WANG Jia-Yu WANG Sheng-Jia Institute of Environmental Resources ＆ Soil Fertilizer Zhejiang Academy of Agricultural Sciences Hangzhou 310021（China）

The methods based on N uptake of aerial-plants, soil organic matter (SOM) dynamics, Jenny's equation, and actual measurement of long-term field experiments in Jiaxing, Quzhou, Huangyan and Hangzhou of Zhejiang Province, China were used to determine the organic mineralization rate being helpful in estimating the organic requirement for SOM equilibrium. The results showed that the estimated mineralization ratios of SOM for Jiaxing and Quzhou were, respectively, 0.0404 and 0.0508 based on N uptake of aerial-plants in non-fertilized plots; 0.0405 and 0.012 using SOM dynamics in non-fertilized plots; and 0.0413 and 0.0513 using the actual investigated data and Jenny's equation. With Jenny's equation, soil organic C balance in manure + N-P-K plots was estimated at nearly 28.8 g kg-1 for Jiaxing and 32.4 g kg-1 for Quzhou with predicted SOM linearly related to the actual investigated values (r2 = 0.9640 for Jiaxing and 0.8541 for Quzhou). To maintain the SOM balance in the non-fertilized plots the recommended rate of organic materials was 3 000-6 600 kg ha-1, and the relevant rates of farm yard manure (FYM) in the manure and N-P-K plots were estimated at 3 375 (dry) and 17670 kg ha-1 (wet) for Jiaxing, 1845 (dry) and 6090 kg ha-1 (wet) for Quzhou.

关键词： equilibrium mathematic modeling rice fields soil organic matter (SOM) turnover

Change of intestinal mucosa barrier function in the progress of non-alcoholic steatohepatitis in rats

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第20期14卷 3254-3258页

作者： Sheng Li Wan-chun wu Chi-yi He Zhen Han Dao-You Jin Lin Wang Department of Gastroenterology YijishanHospital Wannan Medical College Wuhu 241001 AnhuiProvince China

AIM: To explore the change of intestinal mucosa barrier function in the progress of non-alcoholic steatohepatitis (NASH) in rats. METHODS: Thirty-two Sprague-Dawley (SD) rats were randomly divided into control group and model group. Rats in the control group were given normal diet, and rats in the model group were given fat-rich diet. Eight rats in each group were killed at end of the 8th and 12th wk, respectively. The levels of endotoxin, D-xylose, TG, TC, ALT and AST, intestinal tissue SOD and MDA as well as intestinal mucus secretory IgA (sIgA) were measured. The pathology of liver was observed by HE staining. RESULTS: At end of the 8th wk, there was no marked difference in the levels of endotoxin, D-xylose and sIgA between the two groups. At end of the 12th wk, rats in the model group developed steatohepatitis and had a higher serum level of endotoxin (P = 0.01) and D-xylose (P = 0.00) and a lower serum level of sIgA (P = 0.007). CONCLUSION: Intestinal mucosa barrier malfunction may exist in NASH rats and may be an important promoter of NASH in rats.

关键词： Non-alcoholic steatohepatitis Intestinalmucosa barrier Endotoxin Secretory IgA

基于改进遗传算法的风力-柴油联合发电系统扩展规划

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

中国电机工程学报 2006年第8期26卷 23-27页

作者：丁明吴义纯合肥工业大学教育部光伏系统工程研究中心安徽省合肥市230009 安徽电力公司培训中心安徽省合肥市230022

提出基于改进遗传算法的风力-柴油联合发电系统容量扩展规划模型,在满足系统规划和运行等非线性约束条件下,寻求总成本最小的容量扩展方案。在规划总成本中除了计及机组建设的投资费用和运行费用以外,还考虑了因电力供给不足所造成的需... 详细信息

提出基于改进遗传算法的风力-柴油联合发电系统容量扩展规划模型,在满足系统规划和运行等非线性约束条件下,寻求总成本最小的容量扩展方案。在规划总成本中除了计及机组建设的投资费用和运行费用以外,还考虑了因电力供给不足所造成的需求侧停电损失成本。在模型中采用蒙特卡罗方法计算系统的概率性发电成本,不仅考虑了风速随机性、机组随机停运、风速序列和负荷序列相关性,而且考虑了风电穿透功率极限的约束。算例表明,文中所提出的模型和算法是可行的,能对风力发电的规划设计提供一定的帮助。

关键词：风力-柴油联合发电系统改进遗传算法蒙特卡罗仿真机组最优扩展规划

Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2025年第1期34卷 24-33页

作者： LIN Yongjie ZHANG Cancan wu Yuting ZHANG yi LU Yuanwei Key Laboratory of Heat Transfer and Energy Conversion National User-Side Energy Storage Innovation Research and Development CenterBeijing University of Technology

Numerical simulations of the flow and heat transfer characteristics of four shell-and-tube molten salt electric heaters with different perforation rates was ***-and-tube electric heaters have the same geometry and tube arrangement,and all of them use single segmental baffles,but there exist four different baffle openings（φ）,i.e.,0%,2.52%,4.06%,and 6.31%.The results indicated that the reasonable baffle opening could significantly reduce the shell-side pressure drop,effectively decreasing the shell-side flow dead zone *** can eliminate the local high-temperature phenomenon on the surface of electric heating tubes,but the heat transfer coefficient is slightly *** perforated schemes significantly reduce shell-side pressure drop compared to the baseline solution without open *** particular,the φ=6.31% scheme exhibits the optimal performance among all the schemes,with a maximum reduction of up to 50.50% in shell-side pressure drop relative to the unopened holes *** heat transfer coefficient is the highest for φ=0%,exhibiting a range of5.26% to 5.73%,5.14% to 5.99%,and 7.31% to 8.54% higher than φ=2.52%,4.06%,and 6.31%,respectively,within the calculated *** composite index h/（Δp）1/3was higher for all open-hole solutions than that for the unopened-hole *** best overall performance was for φ=6.31%,which improved the composite index by15.29% to 17.18% over the unopened-hole solution.

关键词： molten salt electric heater perforated baffles heat transfer

黄河三角洲地区PRRSV的分离鉴定及ORF4、ORF5基因遗传特性分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

动物医学进展 2012年第6期33卷 37-41页

作者：吴忆春山东滨州职业学院生物工程学院山东滨州256603

采集黄河三角洲地区某猪场发生高热症死亡的仔猪病料,处理后接种Marc-145细胞,传代2代以后出现明显细胞病变,其病毒TCID50为10-4.625/mL,采用PCR检测细胞培养物中伪狂犬病病毒、猪瘟病毒、猪圆环病毒,均为阴性。采用第2代细胞培养物人... 详细信息

采集黄河三角洲地区某猪场发生高热症死亡的仔猪病料,处理后接种Marc-145细胞,传代2代以后出现明显细胞病变,其病毒TCID50为10-4.625/mL,采用PCR检测细胞培养物中伪狂犬病病毒、猪瘟病毒、猪圆环病毒,均为阴性。采用第2代细胞培养物人工感染仔猪,仔猪出现高热、咳嗽、发绀、耳朵发紫、死亡等临床表现,剖检发病猪可见明显的间质性肺炎表现,采集肺、脾、肾和淋巴结等组织进行PCR检验,均能检测到PRRSV,初步认为分离到一株高致病性猪繁殖与呼吸综合征病毒,命名为HSJ-1102株。对该分离株ORF4、ORF5基因进行扩增与克隆测序,序列分析表明,该分离株ORF4基因序列与JXA1、Ch1-a等毒株的同源性较高,在97.4%～99.3%之间,与VR2332等毒株同源性低于90%;分离株ORF5基因序列与JXA1等毒株同源性为97%～99.8%,与Ch1-a,VR2332等毒株同源性较低,分别为92.5%和86.4%。

关键词：猪繁殖与呼吸综合征病毒分离鉴定 ORF4 ORF5

羊源O78型大肠杆菌的分离及16S rDNA序列分析

在线全文

学校读者我要写书评

暂无评论

中国畜牧兽医 2014年第5期41卷 240-243页

作者：吴忆春滨州职业学院生物工程学院山东滨州256603

本试验从1例病死洼地绵羊组织内分离到1株致病性细菌,经培养特性观察、生化鉴定、血清型试验、药敏试验和动物致病性试验,结果表明该病原菌为羊致病性大肠杆菌,其血清型为O78,16SrDNA基因测序结果表明,该菌与大肠杆菌同源性为100%。

关键词：羊大肠杆菌分离 16S rDNA 血清型

猪繁殖与呼吸综合征病毒SYBR GreenⅠ实时荧光定量PCR检测方法的建立

在线全文

学校读者我要写书评

暂无评论

动物医学进展 2013年第2期34卷 20-24页

作者：吴忆春滨州职业学院生物工程学院山东滨州256603

为建立猪繁殖与呼吸综合征病毒(PRRSV)SYBR GreenⅠ实时荧光定量PCR检测方法,采用RT-PCR扩增PRRSV N基因266bp片段,并克隆到pMD18-T载体中,以纯化的重组质粒为模板进行荧光定量PCR扩增,建立了PRRSV荧光定量PCR检测方法,该方法检测灵敏... 详细信息

为建立猪繁殖与呼吸综合征病毒(PRRSV)SYBR GreenⅠ实时荧光定量PCR检测方法,采用RT-PCR扩增PRRSV N基因266bp片段,并克隆到pMD18-T载体中,以纯化的重组质粒为模板进行荧光定量PCR扩增,建立了PRRSV荧光定量PCR检测方法,该方法检测灵敏度可达1.3×101拷贝/μL,与猪瘟病毒(CSFV)、猪传染性胃肠炎病毒(TGEV)、猪流行性腹泻病毒(PEDV)和猪日本脑炎病毒(JEV)均不发生交叉反应,具有很好的特异性和重复性。结果表明,建立的PRRSV实时荧光定量PCR具有特异、敏感、快速、定量、重复性好等优点,可用于临床猪繁殖与呼吸综合征病毒病(PRRS)的诊断。

关键词：猪繁殖与呼吸综合征病毒 N基因实时荧光定量PCR

兔产气荚膜梭菌SD12株的分离与血清型鉴定

在线全文

学校读者我要写书评

暂无评论

中国畜牧兽医 2013年第3期40卷 192-194页

作者：吴忆春滨州职业学院生物工程学院山东滨州256603

从山东某兔场病死兔中分离到一株致病菌,经厌氧培养、菌落形态学观察、培养特性、生化反应、小白鼠毒力试验、动物回归试验、分子生物学试验,结果表明,该病原菌为厌氧菌,对小白鼠和家兔具有强致病力,为A型产气荚膜梭菌,并命名为SD12株。

关键词：兔产气荚膜梭菌 SD12株分离血清型鉴定

在线全文

学校读者我要写书评

暂无评论

鸡传染性法氏囊病病毒SD株毒力测定

动物医学进展 2011年第2期32卷 123-125页

作者：吴忆春山东滨州职业学院生物工程系山东滨州256603

从一个免疫失败鸡场中分离到一株鸡传染性法氏囊病病毒野毒株,命名为SD株。经血清学试验、鸡胚接种、病毒形态观察等证实了分离物为鸡传染性法氏囊病病毒(IBDV)。测定病毒效价ELD50达到10-6.5/0.2 mL;动物回归试验表明,该SD株接种4周龄... 详细信息

从一个免疫失败鸡场中分离到一株鸡传染性法氏囊病病毒野毒株,命名为SD株。经血清学试验、鸡胚接种、病毒形态观察等证实了分离物为鸡传染性法氏囊病病毒(IBDV)。测定病毒效价ELD50达到10-6.5/0.2 mL;动物回归试验表明,该SD株接种4周龄鸡后引起鸡群发病率为100%,病死率达85%,剖检可见法氏囊呈"紫葡萄样"外观,胸腺萎缩,骨髓脂肪化等病变,表现了超强毒株的致病特点。

关键词：传染性法氏囊病病毒SD株致病性超强毒株