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Search Results: 1 - 10 of 33314 matches for " 邓洁 "
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园林透水砖铺装施工技术

北方园艺 , 2013,
Abstract: 提出了在园林透水砖铺装施工中,应根据不同荷载要求,采用不同的平面组合方法与断面结构。并以机动车行道为例,阐述了透水砖铺装的施工工艺流程及技术要点。
论全球化的利弊——对经济全球化中金融问题的分析
李轶,
天府新论 , 2005,
Abstract: 二十多年的经济全球化,给这个世界带来了巨大的变化,同时也产生了许多不容忽视的问题。对其利弊的争论,直接决定着这一运动今后的发展方向,影响着人类文明的进程。经济全球化是一个客观事实,但具有极大的不合理。发展中国家应对金融危机,应立足实际,从内外两方面着手。
刺葡萄花色苷自聚合条件及水合动力学特性的研究

- , 2015, DOI: 10.13982/j.mfst.1673-9078.2015.3.025
Abstract: 花色苷自聚合是实现其稳定化的重要途径。研究了花色苷浓度、pH、温度、时间、纯度、溶剂体系等对刺葡萄花色苷自聚合效应的影响。结果表明:刺葡萄花色苷粗提液适宜的自聚合条件为:pH 3,时间60 min,温度20 ℃,浓度超过0.24 mmo/L。在此条件下,聚合度达到50.5433以上。对于3种不同纯度的刺葡萄花色苷溶液,纯度越高,自聚合效应越强,且更易发生自聚合,提示刺葡萄花色苷分子间共色及辅色效应可能存在制约机制。模拟葡萄酒、葡萄汁的体系条件,发现刺葡萄花色苷在醇系中自聚合作用的强度大于在水系中,两者发生自聚合作用的初始浓度分别为0.03 mmol/L和0.06 mmol/L。通过对花色苷溶液水合动力学分析,发现花色苷浓度增大,其表观水合系数K减小,解离常数pK增大,说明花色苷的自聚合加强了其疏水性,使解离更加困难,稳定性提高。
Self-association of anthocyanins is important for stability. The effects of anthocyanin concentration, pH, temperature, time, purity, and solvent system on the self-association of spine grape anthocyanins (SGA) were studied. The results showed that the optimum conditions for self-association of SGA crude extracts were pH 3, 60 min, 20 ℃, and an anthocyanin concentration of greater than 0.240 mmol/L. Under these conditions, the degree of self-association reached 50.5433. For three SGAs that differed in purity, a higher purity resulted in molecules that could self-associate more easily and more strongly, indicating a common mechanism underlying self-association and copigmentation for anthocyanin. Solution systems were established by simulating grape wine and grape juice. The strength of self-association of crude extracts containing SGA in an alcohol solvent was greater than that in an aqueous solvent, and the initial anthocyanin concentrations that resulted in self-association in the two solvent systems were 0.03 mmol/L and 0.06 mmol/L, respectively. The anthocyanin hydration kinetics were also analyzed. As the anthocyanin concentration increased, the apparent hydration coefficient k decreased and the dissociation constant pK increased, indicating that self-association strengthened the hydrophobic properties and reduced the dissociation of anthocyanins, and therefore improved its stability.
广西,甘肃轮藻属新植物
凌元,国政
植物分类学报 , 1990,
Abstract:
扎龙湿地水环境可持续性度量研究
王永,
地理科学 , 2006,
Abstract: 湿地水环境的持续性度量的指标体系是从湿地水环境系统结构、功能状态和人为因素三个方面构建的。扎龙湿地水环境可持续综合指数的数学模型是可持续综合指数P=0.14P1+0.47P2+0.3P3+0.09P4。分指数(PI)分别是水质指数、水资源量指数、生物指数和土地利用变化指数。计算过程运用了灰关联分析法、层次分析法和分段线性函数等方法,结果表明,扎龙湿地水环境可持续性的总体趋势在减弱,其影响因子已经不利于扎龙湿地生态系统的持续发展。
ADTIQ导致SH-SY5Y细胞凋亡和多巴胺转运体表达降低
谢冰,玉林
北京理工大学学报 , 2015, DOI: 10.15918/j.tbit1001-0645.2015.增刊1.028
Abstract: 新内源性神经毒素1-乙酰基-6,7-二羟基-1,2,3,4-四氢异喹啉(ADTIQ)生成与糖代谢密切相关,可能成为糖尿病并发PD的一个关键因素,但是其神经毒性还不清楚.针对ADTIQ的神经毒性,该研究采用SH-SY5Y细胞为模型,MTT法,AnnexinV/PI双染法,Caspase3/7活性检测细胞存活率和细胞凋亡,Western-blot检测多巴胺转运体(DAT)的表达量.结果表明,随着ADTIQ浓度增大,细胞的存活率逐渐下降,凋亡率增加,同时ADTIQ导致DAT表达降低.研究提示ADTIQ导致多巴胺神经元的凋亡与PD的发生息息相关,糖尿病引起ADTIQ增加,可能成为高糖损伤多巴胺神经元的一个重要原因.
BiPAP无创通气与常规治疗COPD呼吸衰竭50例观察
,汤渝玲
暨南大学学报(自然科学与医学版) , 2010,
Abstract: 目的观察无创正压通气(NPPV)治疗慢性阻塞型肺疾病急性加重(AECOPD)合并重度呼吸衰竭的临床效果。方法回顾分析AECOPD合并重度呼吸衰竭应用NPPV治疗的28例患者(NPPV组),同期住院未接受NPPV治疗的22例患者作为对照组。比较两组血气变化、血气改善时间、住院天数及气管插管率。结果NPPV组患者动脉血酸碱度(pH)、氧分压(paO2)、动脉血氧饱和度(SaO2)及二氧化碳分压(paCO2)改善更明显(P<0.05)。NPPV组血气改善时间比对照组缩短[分别为(7±4)d与(15±7)d,P<0.05]。NPPV组平均住院时间比对照组缩短[分别为(14±5)d与(27±6)d,P<0.05]。气管插管率明显下降(分别为3.5%,22.8%,P<0.05)结论BiPAP呼吸机辅助通气治疗COPD呼吸衰竭疗效肯定,减少了气管插管,有利于患者康复。
地下结构地震反应规范计算方法的对比分析
Comparison of Calculation Methods for Seismic Responseof Underground Structures in Design Codes

,梁发云
- , 2018, DOI: 10.3969/j.issn.1000-0844.2018.05.996
Abstract: 随着地下空间大规模开发利用,地震灾害对其造成的潜在威胁不容忽视。基于《城市轨道交通结构抗震设计规范(GB50909—2014)》和《地下铁道建筑结构抗震设计规范(DG/TJ08—2064—2009)》建议的分析方法,选取惯性力法、反应位移法(国家规范法、上海规范法)、动力时程方法(线弹性方法、等效线性化方法)三类共5种计算方法,以典型两层双柱三跨地铁车站结构为分析对象进行地震反应的对比验算,对上述计算方法的适应性进行评价。分析结果表明,与动力时程方法相比较,惯性力法计算得到的侧墙剪力值偏大,中柱结果较为接近;对于反应位移法,国家规范方法和上海规范方法的计算模型略有不同,但两者计算结果基本相近,其中土体强制位移、集中地基弹簧、土体动剪切模量等参数取值对计算结果影响显著;对于动力时程方法,线弹性方法和等效线性化方法的结果较为接近,且变化趋势相同。
Large-scale development and utilization of underground space is threatened by earthquake. For practical approaches of seismic analysis in the Code for Seismic Design of Subway Structures (DG/TJ08-2064-2009) and Code for Seismic Design of Urban Rail Transit Structures (GB50909-2014), this paper briefly introduces the principles, calculation processes of the codes, and the comparisons between them. Earthquake response analyses of a 2D subway station structure with two stories, double columns, and three spans are calculated by some methods:inertial force method, two response displacement methods (methods in national code and Shanghai code), and two dynamic time-history analysis methods with different assumptions (considering linear elasticity property and equivalent linearization of soil particles). The nonlinear dynamic characteristics of soil obtained using dynamic time-history analysis method are similar to those obtained using an equivalent linearization method. The maximum internal forces of structures with different methods are mainly compared. The applicabilities are summarized and evaluated as follows. The analyses show that compared with dynamic time-history analysis method, the inertial force method has more accurate column results and a bit larger shear force on the left side of the wall. Considering the response displacement method, there are some slight differences between the national code and Shanghai code, even if calculations are basically consistent. The results of response displacement method are mainly influenced by forced displacement, equivalent hypothetical spring in foundation, and the dynamic shear modulus of soil layers. For the dynamic time-history analysis method, the results of linear elastic assumption are close to and have the same trend as those of the equivalent linear one. Combining analysis processes with calculation errors, inertial force method is simple but inaccurate, because it is too simplified. The point of soil-structure interaction is well represented in the response displacement method. The above two methods are suitable for seismic response of simple underground structures. Although the dynamic time-history analysis method requires
论科学研究的审美性质
On the Aesthetic Nature of Scientific Research

唐松林,
- , 2015,
Abstract: 科学研究具有审美性质,乃因为,它是一种对真理的热 爱,对研究主体充满神秘的诱惑,有着宗教般的魅力;它是一 种创造力的绵延,源于主体某种神秘生命力量之冲动,超越了 世俗之目的与手段,具有“可好玩”与“不可用”之意蕴;它是一 种诗性的生活,朴实无华,简单纯洁,聚集了憧憬、勇气、陶醉 与幸福等生活要素。目前的问题是,科学研究之审美性质被遮 蔽,即真理之用遮蔽真理之爱,技术理性遮蔽创造之绵延,绩 效管理遮蔽诗性之生活。其应对策略是,以真理之爱代替真理 之用,以审美理性代替技术理性,以厚生惟和代替绩效管理。
Scientific research is full of aesthetic nature, for it is the love of truth, and there are some mysterious temptation and the religion like charm on the subjects. It is the continuous creativity. It is originated from some mysterious impulse of your life force, and beyond the secular purpose and means, having "fun" and "Non utilitarian" meaning. It is a poetic life. It is simple and pure, and has gathered vision, courage, intoxicated and happiness elements of life. However, the aesthetic nature of scientific research is obscured which means the use of truth frustrates the love of truth, technical rationality hinders creation stretches and performance management disappeared the poetic life. The strategy is the love of truth instead of the use of truth, aesthetic rationality instead of technical rationality, improvement and harmony rather than performance management.
Persist in Principle of Running a Comprehensive and Multi-discipline Medical Journal of Radiology
坚持“综合性、跨学科”的办刊方针

,王丽萍
中国科技期刊研究 , 2002,
Abstract: 明确方向,坚持“综合性、跨学科”的办刊方针,走自己的办刊道路。
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