小麦品质性状在RIL群体中的分离分布规律及与Zeleny沉淀值的回归分析

利用小麦京771×Pm97034产生的重组自交系(recombinant inbred lines,RIL)群体,对Zeleny沉淀值、谷蛋白膨胀指数(swelling index of glutenin,SIG)、湿面筋含量、面筋指数、面粉膨胀势、碱性水保持力(alkline water retention capacity,AWRC)、籽粒硬度、蛋白质含量等8个品质性状在RIL群体中的分离和分布规律进行了研究。结果表明,这些品质性状在重组自交系群体中呈连续变异,分布频率大致接近正态分布,同时存在双向超亲分离现象。多元逐步回归分析表明:SIG值、面筋指数、蛋白质含量和籽粒硬度可以解释Zeleny沉淀值的77.7%的表型变异,其中SIG值与Zeleny沉淀值的关系最密切。

某三甲医院2014～2019年MRSA与MSSA的临床分离分布及其耐药率分析

目的:回顾性分析某三甲医院金黄色葡萄球菌临床标本分布以及耐甲氧西林金黄色葡萄球菌(methicillin resistant Stphylococcus aureus,MRSA)与表皮葡萄球菌(methicillin sensitive Stphylococcus aureus,MSSA)菌株的耐药率,为预防控制措施的制定提供依据。方法: 2014~2019年临床分离出金黄色葡萄球菌2 738株,并对其标本来源和耐药性进行统计分析。细菌鉴定和药敏试验采用美国临床和实验室标准协会推荐检测方法。结果: 2 738株金黄色葡萄球菌的临床标本分离分布主要为痰液、其他分泌物、伤口分泌物、全血、咽喉分泌液、中段尿、脓汁和胸水,分离率分别为49.45%、 13.00%、13.48%、8.25%、4.86%、2.96%、2.19%和1.31%,其中MSSA占总分离率的48.10%( 1 317 /2 738),MRSA占总分离率的51.90%(1 421/2 738)。药敏试验显示,MRSA和MSSA对万古霉素、奎奴普丁/达福普汀和利奈唑胺的耐药率均为0;除了对氯霉素的耐药率比较无统计学差异外( P >0.05),对其他13种抗菌药物的耐药率比较差异均有显著统计学意义( P < 0.01 );对大环内酯类抗生素、克林霉素、青霉素耐药率较高,分别为>63.62%和>90.37%。结论:对住院感染患者应加强标本的微生物学检查,并按照抗菌药物药敏试验结果进行个体化治疗,以加强感染控制。

呼吸内科分离菌分布及耐药性监测比较

目的研究呼吸内科分离菌分布及耐药性监测结果。方法选取2018年4月至2019年3月济南市中区人民医院呼吸内科收治的患者进行鼻咽拭中分离的细菌445株,应用细菌鉴定卡和药敏试验卡进行细菌鉴定和16种药敏的试验。结果革兰阳性菌212株,占47.64%;链球菌144株,占32.36%;革兰阴性菌89株,占20.00%;其中革兰阳性菌在呼吸内科病原菌中较其他偏高,差异有统计学意义(P<0.05)。病原菌分部位置血液链球菌125株,占28.09%;头部葡萄球菌99株,占22.25%;较其他病原菌位置发生率较高,差异有统计学意义(P<0.05)。血液链球菌耐药率最低为头孢噻肟6.2%,头部葡萄球菌耐药率最低为头孢曲松11.2%,金黄色葡萄球菌耐药率最低为头孢曲松6.1%,表皮葡萄球菌耐药率最低为头孢唑啉7.8%,肺炎链球菌耐药率最低为头孢噻肟13.1%。结论呼吸内科分离菌分布及耐药性监测对抗生素的合理应用具有指导意义,避免盲目用药,降低细菌耐药性,提高治疗效果。

250万t/a常减压装置减压塔技术改造

为了进一步提高润滑油基础油原料质量 ,提高总拔 ,采用了规整填料技术及新型进料气液分离分布器 ,对装置减压塔进行了技术改造。改造后减压塔压降降低 ,分离精度提高 ,减四线润滑油基础油原料质量达到设计指标 ,减二、三线润滑油基础油原料质量也有不同程度改善 ,装置总拔显著提高 。

成都-拉萨所需导航性能(RNP4)平行航路安全性评估研究

根据中国民航基于性能导航(PBN)实施路线图,2017年后,PBN航路将达到100%。目前,成都-拉萨RNP4平行航路正在协调实施。对成都-拉萨RNP4平行航路的安全评估进行了研究。首先运用改进的REICH模型介绍了平行航路碰撞风险的计算方法。其次,分析了侧向重叠概率的计算方法。侧向重叠概率由一般偏航和大偏航两部分组成。有别于之前的研究,采用更接近于实际运行现状的分离的双指数分布来描述大偏航密度函数。最后对成都-拉萨RNP4平行航路的碰撞风险进行了评估。评估结果满足安全目标水平的要求,也表明该方法是可行的。

Overlapped peaks resolution for linear sweep polarography using Gaussian-like distribution

A resolution method based on Gaussian-like distribution for overlapped linear sweep polarographic peaks was proposed to simultaneously detect the polymetallic components, such as Zn（Ⅱ） and Co（Ⅱ）, coexisting in the leaching solution of zinc hydrometallurgy. A Gaussian-like distribution was constructed as the sub-model of overlapped peaks by analyzing the characteristics of linear sweep polarographic curve. Then, the abscissas of each peak and trough were pinpointed through multi-resolution wavelet decomposition, the curve and its derivative curves were fitted by using nonlinear weighted least squares （NWLS）. Finally, overlapped peaks were resolved into independent sub-peaks based on fitted reconstruction parameters. The experimental results show that the relative error of half-wave potential pinpointed by multi-resolution wavelet decomposition is less than 1% and the accuracy of Ip fitted by NWLS is higher than 96%. The proposed resolution method is effective for overlapped linear sweep polarographic peaks of Zn（Ⅱ） and Co（Ⅱ）.

5G核心网创新技术研究及应用探索

研究了5G核心网的创新技术,包括多维网络切片、用户面软硬件加速、移动边缘计算(MEC)与5G结合、运维自动化和行业多样化使能技术,并探讨其在行业领域的应用和带来的价值。通过这些创新技术的使用,提出敏捷、算力、智能三位一体的5G核心网概念,以适应万物互联市场拓展的需要。

区域导航技术下的平行航路侧向重叠概率的研究

着重对区域导航平行航路的侧向重叠概率的计算进行了研究。首先,通过数据统计,分析侧向重叠概率在平行航路安全性评估中的重要性;其次,利用双指数分布和分离的双指数分布对区域导航技术下的平行航路侧向重叠概率进行了计算;最后,通过仿真比较来确定最适合区域导航下的平行航路侧向重叠概率的计算方法。结果表明,用分离的双指数分布描述大偏航密度函数所得的侧向重叠概率更接近于实际情况。

谷氨酸结晶中的细晶回用工艺

谷氨酸工业结晶过程中会产生大量难以分离回收的细晶,影响收率和产品质量。文中提出了结晶-粒径切割沉降-细晶回用的工艺设想,将不同粒径的晶体分步分离,细晶浓缩后作为晶种回用至结晶过程。使用扫描电镜和粉末X-衍射(PXRD)研究细晶的晶习及其作为晶种回用的可行性,进行不同条件下的分批等电结晶,参考结晶速率、聚结度、CSD等参数确定细晶回用量、适用过饱和度范围等回用条件。结果表明:液体细晶表观为非典型四方六面体,但在谷氨酸结晶中晶面具有自我修复能力;过饱和度和细晶回用量均影响结晶过程,液体细晶的最适过饱和度范围为1-3;在过饱和度S=2时液体细晶的最适回用量(质量分数)为1%,在S=3时最适回用量为3%。最终证明通过控制合适的晶体生长环境,细晶回用的谷氨酸结晶工艺是可行的。

中国南部九连山常绿阔叶林的区系组成和林分结构

在中国南部的九连山研究了天然的和择伐过的常绿阔叶林的树种组成和林分结构。主要构成树种是常绿阔叶的栲树(Castanopsis fargesii)、罗浮栲(C.fabri)、甜槠栲(C.eyrei)、米槠栲(C.carlesii)、南岭栲(C.fordii)、鹿角栲(C.lamontii)和木荷(Schima superba)。常绿针叶树种的马尾松(Pinus massoniana)和杉木(Cunninghamia lanceolata)也是主要成分。马尾松在坡脊和坡的上部占优势。许多落叶阔叶树种,如光皮桦(Betula luminifera)和拟赤杨(Alniphyllum fortunei)以较低的优势与常绿阔叶树种共同出现。它们补丁状分布在择伐过的林分中。种内的分布格局和种间的空间分布关系表明,主要构成种之间的空间集中分布地的分离是在一个小的尺度上。

Cyclonic Separation Technology:Researches and Developments

Centered on thetechniques and industrial applications of the reinforced cyclonic separation process, its principles and mechanism for separation ot ions, molecules and their aggregates using polyalsperse aroplets are discussed generally; the characteristics and influential factors of fish-hook phenomenon of the grade efficiency curve in cyclonic separation for both gas and liquid are analyzed; and the influence of shear force on particle be- havior （or that of particle swarm） is also summarized. A novel idea for cyclonic separation is presented here： enhancing the cyclonic seoaration process of ions, molecules and their aggregates with monodisperse microspheres and their surface grafting, rearranging the distribution of particles by size using centrifugal field, reinforcing the cyclonic separation performance with orderly arranged particle swarm. Also the investigation of the shortcut flow, recirculation flow, the asymmetric structure and non-linear characteristics of the cyclonic flow field with a com-bined method of Volumetric 3-component Velocimetry （V3V） and Phase-Doppler Particle Anemometer （PDPA） are elaborated. It is recommended to develop new systems for the separation of heterogeneous phases with cyclonic technology, in accordance with the capture and reuse of CO2, methanol to olefins （MTO） process, coal transfer, andthe exploitation of oil shale.

Asymmetry of Photoelectron Angular Distributions in Molecules by Intense Attosecond Extreme Ultraviolet Laser Pulses

We present photoelectron angular distribution of the aligned molecular ion H2^＋ by intense ultrashort attosecond extreme ultraviolet laser pulses from numerical solutions of timedependent Schrodinger equations. Photoionization from a superposition state of the ground 1sσg and the excited 2pσu states with pulses at photon energies above the ionization potential, hω〉Ip, and intensity 10^14 W/cm^2, yields pulse duration dependent asymmetry of photoelectron angular distributions. We attribute the asymmetry to the periodical oscillation of the coherent electron wave packets, resulting from the interference of the two electronic states. For the processes with long pulse durations, such duration dependence is absent and symmetric angular distributions are obtained.

Effect of magnetic pulse pretreatment on grindability of a magnetite ore and its implication on magnetic separation

The pulsed power is a potential means for energy saving and presents an alternative to the conventional mechanical communication for minerals.The effect of magnetic pulse treatment on grindability of a magnetite ore was investigated by grindability tests.The results of the investigation show that the pulsed treatment has little effect on the particle size distribution of the magnetite ore.Significant micro-cracks or fractures are not found by SEM analysis in magnetic pulse treated sample.Magnetic separation of magnetic pulse treated and untreated magnetite ore indicates that iron recovery increases from 81.3% in the untreated sample to 87.7% in the magnetic pulse treated sample,and the corresponding iron grade increases from 42.1% to 44.4%.The results demonstrate that the magnetic pulse treatment does not significantly weaken the mineral grain boundaries or facilitate the liberation of minerals,but is beneficial to magnetic separation.

Research on segregation evaluation methods of asphalt pavement based on air voids distribution

Eye observation was used to evaluate the segregation degree of asphalt pavement, which was not much creditable. To the asphalt pavement, road surface texture measuring method which has appeared recently can identify gradational segregation; but it can’t reflect the influence of the temperature segregation. However, using infrared temperature detector to evaluate the segregation must be taken during paving, which brings much inconvenience. In this paper, measuring the air voids distribution using non-nuclear density gauge to evaluate asphalt pavement segregation was introduced. Result shows that this method can directly reflect the comprehensive results of the two types of segregation in a high efficient and accurate way. Moreover, using the sketch map of segregation area can help to analyze the segregation reason visually.

Liquid phase separation and subsequent dendritic solidification of ternary Fe_(35)Cu_(35)Si_(30) alloy

Liquid Fe35Cu35Si30alloy has achievedthemaximum undercooling of 328 K （0.24TL） with glass fluxing method, and it displayed triple solidification mechanisms. A critical undercooling of 24 K was determined for metastable liquid phase separation. At lower undercoolings,α-Fe phase was the primary phase and the solidification microstructure appeared as homogeneous well-defined dendrites. When the undercooling exceeded 24 K, the sample segregated into Fe-rich and Cu-rich zones. In the Fe-rich zone, FeSi intermetallic compound was the primary phase within the undercooling regime below 230 K, while Fe5Si3intermetallic compound replaced FeSi phase as the primary phase at larger undercoolings. The growth velocity of FeSi phase increased whereas that ofFe5Si3 phase decreased with increasing undercooling. For the Cu-rich zone, FeSi intermetallic compound was always the primary phase. Energy-dispersive spectrometry analyses showed that the average compositions of separated zones have deviated substantially from the original alloycomposition.

Effect of the secondary air distribution layer on separation density in a dense-phase gas–solid fluidized bed

Dry coal separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas-solid fluidized bed beneficiation, the material is stratified according to its density; the high density material layer remains at the bed bottom, and thus the high density coarse particle bed becomes an important infuencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the tradi- tional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 ram, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas-solid separation fluidized with a high density coarse particle layer can be as low as 0.085 g/cm3.

Tuning sol size to optimize organosilica membranes for gas separation

A series of organosilica sols are prepared by the polymeric sol–gel method using 1,2-bis(triethoxysilyl)ethane(BTESE)as the precursor.Particle size distributions of the BTESE-derived sols are systematically investigated by carefully adjusting the synthesis parameters(i.e.,water ratios,acid ratios and solvent ratios)in the sol process.In certain conditions,increasing the water ratio or the acid ratio tends to cause larger sol sizes and bimodal particle size distributions.However,higher solvent ratios lead to smaller sol sizes and unimodal particle size distributions.The organosilica membranes prepared from the optimized sols show excellent H_2 permeances(up to 4.2×10^(-7)mol·m^(-2)·s^(-1)·Pa^(-1))and gas permselectitivies(H_2/CO_2 is 9.5,H_2/N_2 is 50 and H_2/CH_4 is 68).This study offers significant insights into the relationship between the sol synthesis parameters,sol sizes and membrane performance.

Theoretical study on separation density of gravity beneficiation

Separation density is one of the most concerned operating parameters in gravity beneficiation.Although equal-errors cut point or distribution density is usually used as practical separation density in gravity beneficiation, the gravity separating process complexly affected by many kinds of factors is actually carried out at a fluctuant density; namely, the practical separation density is essentially a random variable.The studied results show that the equal-errors cut point is the mathematical expectation of this random variable, and the distribution density corresponds to the highest separation efficiency in the gravity separation process.This shows that the distribution density is the best working point of the gravity separation equipment under a particular operating condition.Therefore,in order to fully develop the function of the gravity separation equipment, the distribution density should be close to the theoretical separation density unlimitedly in the range of minimum fluctuation.

240株肠球菌属临床分离株分布及抗菌药物敏感性分析

肠球菌属所致的感染率、病死率逐年上升,且该病原菌存在固有耐药以及获得性耐药性,抗感染治疗难度大,因此本文加强肠球菌属的分离株分布情况以及对各类抗菌药物的敏感性的探究,从而为临床药物的科学依据提供参考。方法:样本数据来源于我院在各科室送检标本分离成功的240株肠球菌属,针对已经分离的肠球菌属进行鉴定以及药敏试验,其中菌株的鉴定工作借助于细菌检定仪,药敏试验中采用的是纸片扩散法,且在敏感性的测定环节也要借助药敏分析仪器,对此次研究实验涉及的资料数据以及最终的结果进行回顾性探析,开展本文研究课题的论述。结果:在分离出的240株肠球菌属中的病原菌类型具有多样性,最常见的尿肠球菌,其次为粪肠球菌,在抗菌药物敏感性方面,尿肠球菌与屎肠球菌对万古霉素、替考拉宁的敏感性较强。结论:医院内部各科室之间都可能存在肠球菌属,肠球菌属的类型不同对抗菌药物耐药性也会存在差异,但是针对尿肠球菌、粪肠球菌等常见的肠球菌属,对万古霉素、替考拉宁具有较高的敏感性,所以临床可以将其作为主要治疗药物,临床为了取得最佳的治疗效果,在制定治疗方案时也可以开展药敏试验,依据试验结果针对性选择药物。

Solution Properties of Soy Protein in DMSO/Urea Solvent System

Solution properties of 7S globulins (7S), 11S globulins (11S) and soy protein isolates (SPI) in dimethylsulfoxide (DMSO)/urea solvent system were studied by intrinsic viscosity and particle size distributions. The results showed that the existence of urea was the main reason for the denaturation and solubility of soy protein in the system, and the effects were more obvious with increasing of urea concentration in solutions. Suitably dissolution temperature and time contributed to the solubility of soy proteins.