The Optimal Model of Repaying Debt for Construction Projects and Its Applications

In this paper the optimal model of repaying debt combined with operational research and technology economics was presented. It is for solving the problem to increase the benefit of project in terms of planning to repay capital with interest.     

矿区复绿植物猪屎豆种子硬实率与萌发特性的研究

采用不同方法对猪屎豆种子进行处理,并测定了种子的硬实率、吸水率和发芽率.结果表明:猪屎豆种子有较高的硬实率,砂纸摩擦5 min可显著提高种子的吸水率;砂纸摩擦1～7 min均可提高种子的萌发率,摩擦5 min的发芽率达36％,而未摩擦种子发芽率只有11.3％.丙酮处理种子1、2、3、4h不能提高种子的发芽率,时间越长,种子的发芽率越低;过氧化氢处理对种子的催芽没有显著的效果;摩擦后种子在室温(10 ～27℃)、15、25、30、35℃条件下均能萌发;光照对种子的萌发没有显著的影响,说明猪屎豆种子是中光种子.     

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Far-red(FR) light regulates phytochrome-mediated morphological and physiological plant responses.This study aims to investigate how greenhouse tomato morphology and production response to different durations of FR light during daytime and at the end of day(EOD).High-wire tomato plants were grown under intra-canopy lighting consisting of red(peak wavelength at 640 nm) and blue(peak wavelength at 450 nm) light-emitting diodes(LEDs) with photosynthetic photon flux density(PPFD) of 144 μmol m–2 s–1 at 10 cm away from the lamps,and combined with overhead supplemental FR light(peak wavelength at 735 nm) with PPFD of 43 μmol m–2 s–1 at 20 cm below the lamps.Plants were exposed to three durations of FR supplemental lighting including: 06:00–18:00(FR12),18:00–19:30(EOD-FR1.5),18:00–18:30(EOD-FR0.5),and control that without supplemental FR light.The results showed that supplemental FR light significantly stimulated stem elongation thereby resulting in longer plants compared with the control.Moreover,FR light altered leaf morphology toward higher leaf length/width ratio and larger leaf area.The altered plant architecture in FR supplemented plants led to a more homogeneous light distribution inside the canopy.Total plant biomass was increased by 9–16% under supplemental FR light in comparison with control,which led to 7–12% increase in ripe fruit yield.Soluble sugar content of the ripe tomato fruit was slightly decreased by longer exposure of the plants to FR light.Dry matter partitioning to different plant organs were not substantially affected by the FR light treatments.No significant differences were observed among the three FR light treatments in plant morphology as well as yield and biomass production.We conclude that under intra-canopy lighting,overhead supplemental FR light stimulates tomato growth and production.And supplementary of EOD-FR0.5 is more favorable,as it consumes less electricity but induces similar effects on plant morphology and yield.     

Expression of miRNA-22 in ovarian cancer and effect of miRNA-22 over-expression on SKOV-3 ovarian cancer cell proliferation,migration and invasion

AIM: To examine the expression of miRNA-22 in the ovarian tissues and the effect of miRNA-22 over-expression on the proliferation, migration and invasion in SKOV-3 cells. METHODS: The expression levels of miRNA-22 in different ovarian tissues and SKOV-3 cells were determined by qPCR. miRNA-22 was over-expressed by transfection of miRNA-22 mimic. The cell viability was examined by CCK-8 assay. The cell migration was measured by wound healing test. The cell invasion was analyzed by Transwell assay. The protein expression levels of VEGF and P53 were determined by Western blot. RESULTS: Compared with the normal ovarian tissue, the expression level of miRNA-22 was remarkably decreased in the ovarian tumor tissues. After transfection with miRNA-22 mimic, the expression level of miRNA-22 in the SKOV-3 cells was significantly increased, while the cell viability, migration and invasion were obviously decreased. Moreover, the protein expression of VEGF and P53 was dramatically inhibited after over-expression of miRNA-22. CONCLUSION: The decreased miRNA-22 expression may be correlated with the development of ovarian can-cer. Over-expression of miRNA-22 decreases the cell viability, migration and invasion by reducing the protein expression of VEGF and P53.     

跨区作业经济效益影响因素剖析

根据2004年跨区作业调查,计算了联合收割机跨区机收的经济效益,并着重指出了跨区作业经济效益下降的实际问题;通过深入分析其中的原因,指出影响跨区作业经济效益的两大主要因素,是信息系统不完善和散机的无序流动。     

空气悬架对提高车辆抗倾翻能力的分析

针对近年来商用车侧翻事故的凸现,提出了一种利用空气悬架提高车辆倾翻阀值,减小车辆倾翻危险的方法,编写了控制器,在MATLAB中SIMULINK下建立了七自由度车辆模型,并进行了仿真。仿真结果表明,半主动空气悬架能够有效提高车辆倾翻阀值,提高车辆抗侧翻能力。     

外源多酚添加条件下干红葡萄酒颜色和花色苷特性研究

颜色是红葡萄酒重要的感官特征和质量评价指标,花色苷是红葡萄酒呈色、稳定和营养功能的重要物质基础。既往研究极少探讨外源添加天然色素对红葡萄酒颜色质量和花色苷的影响。选取赤霞珠干红葡萄酒为研究对象,于酒精发酵前和发酵后分别添加天然色素Ⅰ和天然色素Ⅱ2种色素,并以添加黄岑苷、绿原酸和没食子酸3种多酚为对照,探究对葡萄酒颜色特征、花色苷种类与含量的影响。结果发现：在发酵前添加天然色素Ⅰ和Ⅱ使得酒体颜色加深、红色色调加强、花色苷含量增加。在发酵后添加以上多酚对葡萄酒颜色和花色苷的影响弱于发酵前添加,但添加天然色素Ⅰ仍然有利于花色苷含量的保持,只是效果弱于发酵前添加。其余多酚物质处理对供试酒样颜色品质影响较小。研究结果表明发酵前添加多酚物质更有利于红葡萄酒颜色品质的提升和稳定、花色苷含量的保持和稳定,天然色素Ⅰ是相对最优质的辅色剂。     

发展壮大蚕桑产业建设和谐新农村

重庆市黔江区位于渝东南部,地处武陵山腹地,与渝鄂相邻,是重庆市六大区域性中心城市之一,幅员面积2402km2,全区辖3个街道办事处、15个镇、12个乡、222个村（居委）、1445个村（居民）小组,总人口50．24万人。黔江区蚕桑生产呈起伏性发展,20世纪90年代后期,出现了桑园面积减少,产茧量严重下滑,步入发展低潮期。     

虉草的研究进展

从生物生态学特性、饲用价值及影响因素、品种选育、栽培与利用等方面对国内外饲用虉草(Phalaris arundinacea L.)研究进行综述。虉草属生长高大、多叶、高产的多年生冷季型禾本科牧草,具有优良的农艺性状和较高的营养价值,其根系强大,既抗旱又耐湿耐寒;除了种子,还可以根茎或分株进行营养繁殖,乃至茎节也可生根并长出枝条;虉草群落一但建成其竞争力很强,并迅速形成单优势种群落;虉草的高生物碱含量影响其饲用价值,通过育种可降低其生物碱含量,提高消化率;虉草种子在成熟前易脱落,栽培品种最适采种期是开花后16—18 d,野生种群是11—13 d;虉草属是高度自交不育植物,在种子生产中仅有少量自交种子;其育种目标是在改善适口性的同时,提高种子保持能力以及种子和饲草产量;虉草具有持续高产和吸收氮素的能力,因此很适合施有机肥或氮肥;虉草可用于放牧、青贮和调制干草,年刈割3~4次,干物质生产效率最高,放牧时,要保持草层高度不超过30 cm,适宜留茬高度为7~10 cm。最后,对我国在虉草研究中亟待解决的问题进行了讨论。     

PCR-RFLP技术检测新嘉兴黑猪氟烷基因

本试验随机抽取嘉兴地区部分猪场新嘉兴黑猪血样,通过PCR-RFLP技术进行氟烷基因检测,结果表明,37头新嘉兴黑猪基因型均为NN,未出现Nn和nn基因型。检测结果为新嘉兴黑猪品种资源保护及合理开发利用提供理论依据。