Selecting Bid with Reasonably Low Price Without Bottom Price Based On Sector Estimate

For raveling out the main shortage of tendering which is the reasonable sector is unreasonable of making the bid evaluation uncertain. In order to eliminate subjective factor, this paper quantificationally analyses the price in bidding and establishes the sector selecting bid model based on the sector estimate idea, which tries to provide a new method and academic basic for determining the reasonable sector. Finally, the article gives an example to prove that the model is feasible and effective and it tries to ensure the bidding assessment public, equitable and just.     

ANALYSIS OF OPERATING CONDITIONS FOR DIAGONAL MINE FANS

We shall discuss the real opererating conditions of the mine fans . in the mine diagonal ventilation system and establish a set of mathematics model for analysing the real engineering to provide judgement for technical manage ment of mine ventilation.     

德宏水牛及其杂交品种体尺测定

试验对36～39月龄全放牧饲养的15头德宏、摩本、尼本水牛进行了体尺测定研究，此项试验根据水牛品种不同分为三个处理组。结果显示，杂交水牛尼本的鬐甲高、十字部高、坐骨节宽比德宏水牛分别提高5.5%、7.4%、9%，差异显著。杂交水牛摩本的鬐甲高、十字部高、坐骨节宽比德宏水牛提高5.9%、8.0%、11.9%，差异显著。摩本的肢长指数优于尼本，差异显著。此项试验结果表明，用尼里、摩拉与德宏水牛杂交，提高了德宏水牛的体尺与体况。     

北方粳稻“植生带”育秧设备定向排种装置的研制

为满足超级稻每穴(2±1)粒种子精量播种的特殊农艺要求,在纸夹定位水稻精密育秧设备研究基础上,研发出一种新型超级稻定向排种装置。初步排种试验表明,该装置可将种箱中杂乱无章的稻种分离出来后,在组合滑道上逐渐沿其长轴方向排列成连续的种子流,为超级稻植生带育秧设备的研制提供理论与实践依据。     

机床传动误差测量中的空域法分析

从空间域的角度讨论了信号处理的一种特殊方法，介绍了它的特点，建立了空域傅氏变换数学模型，并且给出了实用效果。实践证明空域分析法应用于机床传动链一类的特殊场合是有效的。     

灌区评估指标的选取及灰关联分析

该文探讨了灌区评估指标体系的建立方法,对评估指标的选取与预处理进行了系统分析,并尝试应用灰色系统理论中的灰关联度分析法,对灌区评估指标进行关联分析,从而很方便地进行灌区之间的评估、排队及比较,与传统的强制打分法相比,此法简便易行,无需预先建立评判标准,因此是一种新的评估分析法。     

土方机械落物保护结构动态仿真及试验

简述了土方机械落物保护结构的特点及性能要求,建立了落物保护结构受瞬态冲击响应的有限元结构动力学方程并提出了求解算法。以某装载机落物保护结构为例,建立了落物保护结构的非线性有限元模型,讨论了有限元网格划分及载荷施加方法,分析了落物保护结构的主要设计参数对冲击点最大位移及落锤速度和加速度的影响,并给出了更合理的结构。在试验台上对该装载机落物保护结构进行了落物冲击试验,试验结果和仿真结果吻合较好。落物保护结构的动态仿真为结构的设计提供了依据。     

乌苏里拟鲿(Pseudobagrus ussuriensis)同工酶分析

采用聚丙烯酰胺凝胶电泳方法,对黑龙江水系乌苏里拟鲿(Pseudobagrus ussuriensis)心、肝、肾、眼、肌肉和性腺共6种组织进行了9种同工酶(ADH、EST、G6PDH、GDH、IDH、LDH、MDH、POD、SOD)的分析。结果表明,乌苏里拟鲿EST、GDH、IDH、POD同工酶谱中存在不同程度的组织特异性,EST表现出明显的性别差异性。共记录19个基因位点,多态位点百分数P=21.05%,种群遗传偏离指数d=-1,该乌苏里拟鲿种群内部杂合子缺失较严重,偏离Hardy-Weinberg平衡,遗传多样性较低。     

磷素水平对不同大豆品种钾素吸收效率的影响

通过原子吸收分光光度计法研究了施磷量对不同大豆品种各器官及全株吸收钾素营养的影响,结果表明:施磷量对不同大豆品种植株及各器官钾素含量有较大影响.不同品种不同处理全株及各器官钾素含量从分枝期逐渐增加,开花期达到高峰,随后下降至成熟期;同一品种不同处理间钾素含量三个品种都是P10处理全株及各器官钾素含量最高,整个生育期高磷或不施磷都会影响钾素含量,只有适宜的施磷才能促进钾素含量达到最高峰.同一处理不同品种全株及各器官钾素含量在品种间没有明显的变化规律.     

Characterization of Bioactivities and Biosynthesis of Angucycline/Angucyclinone Derivatives Derived from Gephyromycinifex aptenodytis gen. nov., sp. nov.

Strain NJES-13^T is the type strain and currently the only species of the newly established actinobacteria genera Aptenodytes in the family Dermatophilaceae isolated from the gut microbiota of the Antarctic emperor penguin. This strain demonstrated excellent bioflocculation activity with bacteria-derived exopolysaccharides (EPSs). Moreover, it produced bioactive angucycline/angucyclinone derivatives (ADs) and contained one type III polyketide synthase (T3PKS), thus demonstrating great potential to produce novel bioactive compounds. However, the low productivity of the potential new AD metabolite was the main obstacle for its chemical structure elucidation. In this study, to increase the concentration of targeted metabolites, the influence of cellular morphology on AD metabolism in strain NJES-13^T was determined using glass bead-enhanced fermentation. Based on the cellular ultra-structural observation driven by bacterial EPSs, and quantitative analysis of the targeted metabolites, the successful increasing of the productivity of three AD metabolites was achieved. Afterward, a new frigocyclinone analogue was isolated and then identified as 2-hydroxy-frigocyclinone, as well as two other known ADs named 2-hydroxy-tetrangomycin (2-HT) and gephyromycin (GPM). Three AD metabolites were found to demonstrate different bioactivities. Both C-2 hydroxyl substitutes, 2-hydroxy-tetrangomycin and 2-hydroxy-frigocyclinone, exhibited variable inhibitory activities against Staphylococcus aureus, Bacillus subtilis and Candida albicans. Moreover, the newly identified 2-hydroxy-frigocyclinone also showed significant cytotoxicity against three tested human-derived cancerous cell lines (HL-60, Bel-7402 and A549), with all obtained IC₅₀ values less than 10 µM. Based on the genetic analysis after genomic mining, the plausible biogenetic pathway of the three bioactive ADs in strain NJES-13^T was also proposed.