单叶解析函数强微分超属的最佳从属

复分析是研究复函数,特别是解析函数的数学理论,是古老而富有生命的数学分支之一,是一个经典的研究领域。近年来,越来越多的学者研究微分从属和强微分超属,其理论与方法不反应用于泛函分析、拓扑学、微分几何等数学分支,还涉及自然科学的诸多领域,如动力系统、量子力学、信号分析等。因此,对于微分从属和强微分超属的研究具有重要的理论意义与潜在的应用价值。学者OROS G I和OROS G首先引入并研究了强微分超属的概念及其性质,在此基础上,本文引入强微分超属和最佳从属子概念,研究并证明了在单叶解析函数单位圆盘边界未知的情况下,强微分超属的最佳从属子。

抗产超广谱β-内酰胺酶菌属药物的后效应

目的 :测定 5种抗菌药物对产超广谱 β 内酰胺酶菌属 (ESBLs)的抗菌药物后效应 (PAE)。 方法 :ESBLs菌属分离鉴定采用SCAN4全自动细菌分析仪 ;MIC测定应用微量肉汤稀释法 ;PAE采用光密度法。结果 :碳青霉烯类、氨基糖苷类和氟喹诺酮类对产ESBLs菌的PAE都比较长 ,并且随药物浓度的增加 ,PAE均有增加的趋势 ,在 16倍MIC时PAE有明显延长。结论 :碳青霉烯类、氨基糖苷类和氟喹诺酮类对产ESBLs菌的PAE都较明显 ,在设计给药方案时应重视PAE的影响 。

规模产业化6N超纯锌、6N超纯铜等高品质超纯金属材料技术

颁奖词河南国玺超纯金属材料有限公司开发的规模产业化6N超纯锌、6N超纯铜等高品质超纯金属材料技术突破了传统提纯方法无法实现规模化生产的瓶颈,具有良好的灵活性、实用性和拓展性,打破了国外技术垄断,填补了国内空白,在军用和民用领域具有巨大的应用潜力。项目概述河南国玺超纯金属材料有限公司（简称＂河南国玺公司＂）应市场急需,立足于超纯金属材料的研发创新和规模化生产,基于自有的离子树脂交换技术,研发出了国际先进水平的超纯金属提纯技术。

与一类积分算子相关的sandwich-type定理

利用微分从属和微分超属的方法以及一些定义条件,研究一类积分算子I具有保持解析函数从属和超属的性质,得到关于积分算子I的一个sandwich-type定理.

涉及Noor多重积分算子的解析函数的中间定理

引入了解析函数f(z)的n阶Noor多重积分算子Iδn,pf(z),并应用微分从属和微分超属的方法得到了这个算子的一些性质.所得结果推广了前人的结果.

Differences of Uptake and Accumulation of Zinc in Four Species of Sedum

Four species of Sedum L. were grown in nutrient solution for the comparison of their Zn uptake and accumulation. S. alfredii Hance showed much greater tolerance to Zn than the other three species. Shoot and root yields of S. sarmentosum Bunge, S. bulbiferum Makino, and S. emarginatum Migo decreased with increasing Zn concentration in the solution, while shoot and root yields of S. alfredii increased when Zn concentration was ≤80 mg·L -1. At 80 mg·L -1 Zn, Zn concentration in shoots of S. alfredii reached 19.09 mg·g -1. S. alfredii was also more efficient in Zn translocation from roots to shoots, while Zn concentration in shoots was much higher than in roots. However, this was not the case for the other three species. The results showed that S. alfredii is a Zn hyperaccumulator and could be useful for the phytoremediation of Zn-contaminated soils.

Research Progress of Phytoremediation Technology on Soils Polluted by Heavy Metals in Mining Areas

Phytoremediation is an efficient and economic ecological technology. It includes phytostabilization, phytovolatilization, and plant absorption. In the research, status quo and progress of Phytostabilization and plant absorption in soils polluted with heavy metals in metal mines were summarized, including the characteristics and status quo of phytoremediation and selection method of hyperaccumulator. In addition, further research was proposed as well.

THE SECRETORY STIGMAS IN POPULUS: DEVELOPMENT, CYTOCHEMISTRY, ULTRASTRUCTURE AND THEIR RELATION TO INTERSECTIONAL INCOMPATIBILITY *

The stigmas of five species, Populus euphratica Oliv., P. alba L., P. simonii Carr., P. lasiocarpa Oliv. and P. nigra L. have been studied. Scanning electron microscopy re veals that exudates are present in the intercellular spaces, in the clefts between the multicel lular papillae and on the receptive surface. Release and movement of exudates can be visual ized when the fresh stigmas are stained with sudan Ⅲ and auramine O. Paraffin and semi thin resin sections of stigmas after glutaraldehyde osmium fixation evidence the lipidic nature of the exudates. Transmission electron microscopy reveals the glandular features of the stigmatic papillae cells, such as abundance of rough and smooth endoplasmic reticulum, polyribosomes, and well developed dictyosomes with secretory vesicles. Pellicle and epicuticular lamellate layers which have been considered as typical features of the dry type stigmas are also present in the species where stigmas appear extremely wet. It is concluded that stigmas in all of the five species are secretory at the receptive stage. Well developed generative and sperm cells were observed in the pollen tubes penetrating through the deep layers of the stigmatic tissue in the reciprocal crosses between P. euphratica and P. simonii, which indicated that there is no significant barrier in the stigma.

Frictional characteristics of sheet metals with superimposed ultrasonic vibrations

The forming performance of sheet metals in the deep-drawing process with ultrasonic vibrations can be improved by the surface effect between the sheet metal and the die.A sheet metal friction test with ultrasonic vibrations is performed to explore the cause of the surface effect.The frictional characteristics are investigated,and the corresponding friction expressions are established based on the contact mechanics and the elastic–plastic contact model for rough surfaces.Friction is caused by the elastic–plastic deformation of contacting asperities under normal loads.The actual contacting region between two surfaces increases with normal loads,whereas the normal distance decreases.The normal distance between the contacting surfaces is changed,asperities generate a tangential deformation with ultrasonic vibrations,and the friction coefficient is eventually altered.Ultrasonic vibrations are applied on a 40Cr steel punch at the frequency of 20 kHz and the amplitude of 4.2μm.In the friction tests,the punch is perpendicular to the surface of the magnesium alloy AZ31B sheet metals and is sliding with a relative velocity of 1 mm/s.The test results show that the friction coefficient is decreased by approximately 40%and the theoretical values are in accordance with the test values;Ultrasonic vibrations can clearly reduce wear and improve the surface quality of parts.

Emerging two-dimensional metallenes:Recent advances in structural regulations and electrocatalytic applications

Benefiting from the ultrahigh specific surface areas,highly accessible surface atoms,and highly tunable microscopic structures,the two-dimensional metallenes as nanocatalysts have displayed promising performance for various electrocatalytic reactions.Herein,we reviewed recent advances on metallenes in structural regulations including defect,phase,strain,interface,doping,and alloying engineering strategies and their applications in energy electrocatalytic reactions involving oxygen reduction reaction,carbon dioxide reduction reaction,hydrogen evolution reaction,and small molecules oxidation reaction.Finally,we proposed the future challenges and directions in this emerging area.

Enhanced corrosion resistance of micro-arc oxidation coated magnesium alloy by superhydrophobic Mg-Al layered double hydroxide coating

To further enhance the corrosion resistance of the porous micro-arc oxidation(MAO) ceramic layers on AZ31 magnesium alloy, superhydrophobic Mg-Al layered double hydroxide(LDH) coating was fabricated on MAO-coated AZ31 alloy by using in-situ growth method followed by surface modification with stearic acid. The characteristics of different coatings were investigated by XRD, SEM and EDS. The effect of the hydrothermal treatment time on the formation of the LDH coatings was studied. The results demonstrated that the micro-pores and cracks of MAO coating were gradually sealed via in-situ growing LDH with prolonging hydrothermal treating time. Electrochemical measurement displayed that the lowest corrosion current density, the most positive corrosion potential and the highest impedance modulus were observed for superhydrophobic LDH/MAO coating compared with those of MAO coating and LDH/MAO coating. Immersion experiment proved that the superhydrophobic LDH/MAO coating with the active anti-corrosion capability significantly enhanced the long-term corrosion protection for MAO coated alloy.

宇宙车间

随着宇航事业的发展,出现了一个新的科技领域:宇宙工艺。在苏联“礼炮号”载人空间站和“联盟号”飞船上,长时间地进行了在空间制取新材料和在地球上根本无法进行的工艺过程的试验(在微重力条件下制取半导体、特种合金、研究扩散和结晶工艺)。例如,在“礼炮-7号”

Fabrication of cast carbon steel with ultrafine TiC particles

The carbon steels dispersed with ultrafine TiC particles were fabricated by conventional casting method. The casting process is more economical than other available routes for metal matrix composite production, and the large sized components to be fabricated in short processing time. However, it is extremely difficult to obtain uniform dispersion of ultrafine ceramic particles in liquid metals due to the poor wettability and the specific gravity difference between the ceramic particle and metal matrix. In order to solve these problems, the mechanical milling (MM) and surface-active processes were introduced. As a result, Cu coated ultrafine TiC powders made by MM process using high energy ball milling machine were mixed with Sn powders as a surfactant to get better wettability by lowering the surface tension of carbon steel melt. The microstructural investigations by OM show that ultrafine TiC particles are distributed uniformly in carbon steel matrix. The grain sizes of the cast matrix with ultrafine TiC particles are much smaller than those without ultrafine TiC particles. This is probably due to the fact that TiC particles act as nucleation sites during solidification. The wear resistance of cast carbon steel composites added with MMed TiC/Cu-Sn powders is improved due to grain size refinement.

Energy Level of Three-Mode Harmonic Oscillator for Coordinate Operators Satisfying Cyclic Commutative Relations Obtained by IEO Method

Eigenvalue-solution to those Hamiltonians involving non-commutative coordinates is not easily obtained. In this paper we apply the invariant eigen-operator （IEO） method to solving the energy spectrmn of the three-mode harmonic oscillator in non-commutative space with the coordinate operators satisfying cyclic commutative relations, [X1, X2] = [X2, X3]=[X3, X1] = iθ, and this method seems effective and concise.

Challenges of Process Technology in 32nm Technology Node

According to the international technology roadmap for semiconductors （ITRS）,32nm technology node will be introduced around 2009. Scaling of CMOS logic devices from 45 to 32nm node has come across significant barriers. Overcoming these pitch-scaling induced barriers requires integrating the most advanced process technologies into product manufacturing. This paper reviews and discusses new technology applications that could be potentially integrated into 32nm node in the following areas：extension of immersion lithography,mobility enhancement substrate technology,metal/ high-k （MHK） gate stack, ultra-shallow junction （USJ） and other strain enhancement engineering methods, including stress proximity effect （SPT）, dual stress liner （DSL）, stress memorization technique （SMT）, high aspect ratio process （HARP） for STI and PMD,embedded SiGe （for pFET） and SiC （for nFET） source/drain （S/D） using selective epitaxial growth （SEG） method,metallization for middle of line （MOL） and back-end of line （BEOL） ,and ultra low-k （ULK） integration.

美国铝业开发可将任何铝废料转化为高纯度铝的新工艺

美铝公司正在开发一种新工艺-ASTRAEA,该工艺可以将任何低质量的铝废料转化为纯度远超商业铝冶炼厂纯度水平的铝,从而可利用大量未使用的铝废料,创造一个全新的价值链。ASTRAEA工艺将建立一个强大的解决方案,可以处理消费后的铝废料,无论合金组合如何,都可以将其精炼至P0101。然后,这种超纯金属可以与纯度较低的废料混合,生产出符合纯度值的金属,完全满足大多数轧制和挤压应用(包括航空航天应用)对材料纯度的要求,从而大大改善可用作原材料的消费后废料的供应。美铝用于这项技术的最初原材料是Zorba,它是一种汽车切碎的废铝。由于该行业无法从这些废料中去除微量金属,因此大部分金属用于制造汽油动力汽车的发动机缸体,这些发动机缸体可以容忍纯度较低的废料作为原材料。

Screening-Dependent Study of Superconductivity in 3d-Transition Metals Binary Alloys Superconductors

In the present article, we report the screening-dependent study of the superconducting state parameters （SSPs）, viz. electron-phonon coupling strength A, Coulomb pseudopotential μ^＊, transition temperature TC, isotope effect exponent a, and effective interaction strength No V of 3d-band transition metals binary alloys superconductors have been made extensively in the present work using a model potential formalism and employing the pseudo-alloy-atom （PAA） model for the first time. Five local field correction functions proposed by Hartree （H）, Taylor （T）, Ichimaru-Utsumi （IU）, Farid et al. （F） and Sarkar et al. （S） are used in the present investigation to study the screening influence on the aforesaid properties. The present results of the SSPs obtained from H-screening are found in qualitative agreement with the available experimental data wherever exist.

Strengthening contributions in ultra-high strength cryorolled Al-4%Cu-3%TiB_2 in situ composite

Ultra-high strength Al alloy system was developed by cryorolling and the contribution of various strengthening mechanisms to the overall yield strength of the system was evaluated. Cryorolling of Al-4%Cu-3%TiB2 in situ composite followed by short annealing at 175 ℃ and ageing at 125℃ resulted in an ultra-high yield strength of about 800 MPa with 9%total elongation. The strengthening contributions form solid solution strengthening, grain refinement, dislocation strengthening, precipitation hardening and dispersion strengthening were evaluated using standard equations. It was estimated that the maximum contribution was from grain refinement due to cryorolling followed by precipitation and dispersion strengthening.

Analysis of Ultrasound Propagation in a Metal Rod by Using Finite Element Method

A metal rod is used in the high temperature testing for ultrasonic propagation and heat output, but the trailing ech- oes generated by ultrasonic penetration through the metal rod seriously affect the recognition and extraction of characteristic signals. According to the phenomenon, the Finite Element Method （FEM） is used to analyze ultrasonic penetration through a metal rod, the reason of the trailing echoes and the regularity of ultrasonic signals. The motion equation of ultra- sonic propagation in a metal rod is established and calculated, then the simulation signals and instantaneous eartographies of the process are obtained. Based on the results of the analysis, it can be concluded that the intervals of the trailing echoes are de- termined by the rod＇ s diameter and wave velocity. In practical applications, the FEM is used to analyze ultrasonic propagation in the designed buffer rod at first. Based on the characteristics of the simulation signals, the material and dimension are ad- justed and selected, aiming to identify the characteristic echo and trailing echoes in time domain and extract characteristic echo from the ultrasonic signals available.

Fabrication of cobalt aluminum-layered double hydroxide nanosheets/carbon spheres composite as novel electrode material for supercapacitors

A new design route was presented to fabricate cobalt aluminum-layered double hydroxide(CoAl-LDH)thin layers whichgrow on carbon spheres(CSs)through a growth method.The CoAl-LDH thin layers consist of nanoflakes with a thickness of20nm.The galvanostatic charge-discharge test of the CoAl-LDH/CSs composite shows a great specific capacitance of1198F/g at1A/g(based on the mass of the CoAl-LDH/CSs composite)in6mol/L KOH solution,and the composite displays an impressive specificcapacitance of920F/g even at a high current density of10A/g.Moreover,the composite remains a specific capacitance of928F/gafter1000cycles at2A/g,and the specific capacitance retention is84%,indicating that the composite has high specific capacitance,excellent rate capability and good cycling stability in comparison to pristine CoAl-LDH.