路走空处则顺 货卖缺处则畅——企业营销韬略漫谈

路走空处则顺货卖缺处则畅——企业营销韬略漫谈文／陈兆祥《孙子兵法·虚实篇》曰：“夫兵形象水，水之形避高而趋下，兵之形避实而击虚。水因地而制流，兵因敌而制胜。”意思是说，用兵作战与水的流动相似，水是避开高处而流向低处，克敌制胜是避开敌人坚固、实备之处去...

机场航空处在强劲上攻临界点上

上周末点评的数字电视黑马南京熊猫(600775)周一最高逆市大涨9％,周二继续稳步上攻,在大盘暴跌中表现非常抢限。连续单边逼空式下跌是近期主要走势特点,1630点、1600点、甚至1580点等支撑位都一度悉数被击穿,市场中各种利空传言和恐慌气氛弥漫。有经验投资者都知道,这种大浪淘沙式急跌之后,有基金等主流资金逆市建仓的品种自然水落石出。从海南航空每股亏损1.74元不跌反涨,到东方航空、南方航空等个股在大盘暴跌中胜似闲庭信步式的表现分析,机场。

Data processing method for aerial testing of rotating accelerometer gravity gradiometer

A novel method for noise removal from the rotating accelerometer gravity gradiometer(MAGG)is presented.It introduces a head-to-tail data expansion technique based on the zero-phase filtering principle.A scheme for determining band-pass filter parameters based on signal-to-noise ratio gain,smoothness index,and cross-correlation coefficient is designed using the Chebyshev optimal consistent approximation theory.Additionally,a wavelet denoising evaluation function is constructed,with the dmey wavelet basis function identified as most effective for processing gravity gradient data.The results of hard-in-the-loop simulation and prototype experiments show that the proposed processing method has shown a 14%improvement in the measurement variance of gravity gradient signals,and the measurement accuracy has reached within 4E,compared to other commonly used methods,which verifies that the proposed method effectively removes noise from the gradient signals,improved gravity gradiometry accuracy,and has certain technical insights for high-precision airborne gravity gradiometry.

VIPer50/50A单片开关电源的原理与应用电路设计

介绍了VIPer5 0 5 0A单片开关电源芯片的主要性能特点和基本工作原理 ,对典型应用电路进行了重点分析 。

沈从文小说中的艺术空白

毫无疑问,沈从文是一个具有强烈艺术空白意识的作家.在一切文学作品中,都存在一定的“空白”.这些“空白”的成因有二.一属作者“无意”而成.就是说,尽管作者对某一人物、某一情节、甚至某一细节,主观上希图进行精密的描写,不容出现什么遗漏,但若读者细加检察,在其行文中,仍可发现一定的情节或细节的描写“空白”.我们把这种无意形成的“空白”称之为“自然空白”.一属作者“有心”之作,即作者出于艺术上的需要,对某一人物、某一情节或细节,作有意的虚写或省略,我们把这样形成的“空白”,称之为“艺术空白”.

Growth twinning behavior of cast Mg-Zn-Cu-Zr alloys

The morphology and orientation of the growth twins formed in the cast Mg-Zn-Cu-Zr alloys aged at 100 ＆#176;C were characterized using optical microscopy and transmission electron microscopy. It was found that twins were invisible in the as-cast or solutionized Mg-Zn-Cu-Zr alloys while {10 12} twins were exclusively formed in the aged condition. The twinning behavior was significantly affected by two factors, namely, the Zn content and the heat treatment process. A possible formation mechanism of such growth twins was discussed using the viewpoint of vacancy.

Seismic data analysis based on spatial subsets

There are some limitations when we apply conventional methods to analyze the massive amounts of seismic data acquired with high-density spatial sampling since processors usually obtain the properties of raw data from common shot gathers or other datasets located at certain points or along lines. We propose a novel method in this paper to observe seismic data on time slices from spatial subsets. The composition of a spatial subset and the unique character of orthogonal or oblique subsets are described and pre-stack subsets are shown by 3D visualization. In seismic data processing, spatial subsets can be used for the following aspects： （1） to check the trace distribution uniformity and regularity; （2） to observe the main features of ground-roll and linear noise; （3） to find abnormal traces from slices of datasets; and （4） to QC the results of pre-stack noise attenuation. The field data application shows that seismic data analysis in spatial subsets is an effective method that may lead to a better discrimination among various wavefields and help us obtain more information.

峨眉山金顶铜碑

峨眉山金顶的铜碑,在卧云庵内。该碑虽然经历了大自然的风雨剥蚀,至今仍光润可鉴,字迹清晰。碑文中记载三百多年前,峨眉山顶曾有一座精湛的铜殿,此殿始于明万历三十年(1602年)之春,竣工于次年之秋。“殿高2丈5尺,广1丈4尺4寸,深1丈3尺5寸,上为重檐雕甍,环以绣棂琐窗,中坐大士,傍绕万佛,门枋空处,雕画云栈剑阁之险,及入山道路逶迤曲折之状。渗以真金,巍峨晃漾,照耀天地。”这确是一座精致的古代建筑珍品。据说,在当时闻名遐迩,引来许多名人观赏,得到了极高的赞誉。清人王曰曾有诗云:“重家崇胜事,法象得辉煌,玉局三曾诰,金宫百和香。塔熔六艺乘,钟吼老龙王,碑篆为霸古。

Research of Oxidation Resistance of PVDF Hollow Fiber Membrane Used in Water Treatment

[Objective] The aim was to research the influences of different formulations on oxidation resistance of PVDF hollow fiber membrane.[Method]The immersion precipitation phase inversion method was employed to make casting solution with different formulations into hollow fiber membrane.The membrane was immersed in 1% NaClO solution for testing its performance changes.[Result]The membrane made by materials with bigger molecular weight had better oxidation resistance performance;the surfactant tween-80 could increase water flux,but lead to lower rupture intension;Pore-forming agent PEG400 do better than PVP in the oxidation resistance of membrane.[Conclusion]This study will provide a good idea for the development of the PVDF membrane with high oxidation resistance.

Effects of vacuum pre-oxidation process on thermally-grown oxides layer of CoCrAlY high temperature corrosion resistance coating

The influence of the certain specific vacuum pre-oxidation process on the phase transformation of thermally-grown oxides（TGO） was studied.The CoCrAlY high temperature corrosion resistance coatings were produced onto the nickel-based superalloy substrate by high velocity oxygen fuel（HVOF）.It suggests that the TGO usually consists of a great number of chromium oxides,cobalt oxides and spinel oxides besides alumina during the initial period of the high temperature oxidation if the specimens are not subjected to the appropriate vacuum pre-oxidation process.Furthermore,the amount of alumina is strongly dependent on the partial pressure of oxygen;while the CoCr2O4 spinel oxides are usually formed under the conditions of higher partial pressure of oxygen during the initial period and the lower partial pressure of oxygen during the subsequent period of the isothermal oxidation.After the appropriate vacuum pre-oxidation process,the TGO is mainly composed of alumina that contains lower Y element,while alumina that contains higher Y element sporadically distributes,and the spinel oxides cannot be found.After a longer period of the isothermal oxidation,a small amount of porous CoCr2O4 and the chrome oxide sporadically distribute near the continuous alumina.Additionally,after the appropriate vacuum pre-oxidation process,the TGO growth rate is relatively slow.

Epitaxy of SiGe HBT Structure by High Vacuum/Rapid Thermal Processing/Chemical Vapor Deposition

The strained SiGe material has been grown by using the newly developed High Vacuum/Rapid Thermal Processing/Chemical Vapor Deposition (HV/RTP/CVD) system.Device quality material is grown by handling process after careful design. The Ge fraction varies up to 0 25, and the n and p type doping is well controlled,which are both adapted to the fabrication of Heterojunction Bipolar Transistors (HBT). The SiGe HBT structure, namely n Si/i p + i SiGe/n Si structure, has been investigated, with which, the HBTs are fabricated and show good performance. The new system has been proved potential and practicable.

小议电磁学中的理论模型

理论模型是从物理客观实际中抽象出来的,利用理论模型可以准确地表达物理规律在分析解决一些实际问题时,则须利用已知的物理规律,将实际的问题抽象成物理规律所要求的物理模型,继而进行分析、研究、求解。能否正确地找到理论与实际之间的对应关系,是正确解决问题的一个关键。下面就电磁学教学中遇到的一些情况,对此问题予以说明。 在研究无限大带电平面外的场时,由高斯定理,导出平面外的场E=σ/2ε_α。

Removal of manganese from waste water by complexation-ultrafiltration using copolymer of maleic acid and acrylic acid

Copolymer of maleic acid and acrylic acid （PMA-100）, combining with polyvinyl butyral （PVB） ultrafiltration membrane was used for the removal of Mn（II） from waste water by complexation-ultrafiltration. The carboxylic group content of PMA-100 and the rate of complexation reaction were measured. Effects of the mass ratio of PMA-100 to Mn（II） （n）, pH, background electrolyte, etc on the rejection rate （R） and permeate flux （J） were investigated. The results show that carboxylic group content of PMA-100 is 9.5 mmol/g. The complexation of Mn（II） with PMA-100 is rapid and completed within 5 min at pH 6.0. Both R and J increase with pH increasing in the range of 2.5-7.0, and R increases with the increase of n at pH 6.0 while J is little affected. The background electrolyte leads to the decrease of R, and CaCl2 has much greater effect on R than NaCl at the same ionic strength.

浅谈对学生杆上的动作感觉的培养

1、培养杆上动作的重要性 在背跃式跳高杆上动作教学中,学生由于初学认识结构与动作之间的联系未建立,神经联系处于冷化阶段,常常出现心理明白,而实际做不出来,或时而做对时而做错的现象。

给主我的爱(祷告文)

有人对祷告文不以为然,认为谁照着文章去祷告,那不是心灵的流露,是编的。可是,你知道吗?有的祷告文是祷告时的记录(如诗篇),同时也是我们心中要祷告的心声。这样的祷告,你也会同心地说阿们的。请听以下的祷告。

Silicon limitation on primary production and its destiny in Jiaozhou Bay,China V:Silicon deficit process

Silicon is a necessary nutrient for diatoms, silicon uptake in diatom reproduction decreased sea- water silicon content. This paper clarified the characteristics of silicon transferring in the sea, which plays an important role in phytoplankton growth, zooplankton graze and marine ecosystem. Analysis revealed that silicate is supplied by terrestrial sources, through plankton uptake, death, and eventually deposits to the sea bottom, and cannot diffuse upward. This is a general silicon deficit process. Many global marine waters showed the same silicon transfer route: land→silicon biogeochemical process→sea bottom. River flow brings abundant silicate into marine waters, silicate concentration in the waters decreased in the distance away from the river estuaries. In discussion of silicon characteristics and its transfer route, it was considered that the main factor controlling the mechanism of diatom and non-diatom red tides occurrence is silicon, and the changes in silicon source. Human activities, such as sea-route cutting by building embankment and dam, and silicon supplement by the sea, such as sandstorm, rainstorm and storm tide, have largely impaired the earth ecosystem and hugely threatened the human existence. It is suggested in this paper that man should resume the original face of the Si input into the sea to keep natural ecosystem in sustainable pattern.

Microstructure and mechanical properties of Mg-6Gd-3Y-0.5Zr alloy processed by high-vacuum die-casting

GW63K （Mg-6Gd-3Y-0.5Zr） magnesium alloys were prepared successfully by high-vacuum die-casting. Effects of fast shot speed and vacuum level on the grain size and mechanical properties of this alloy were studied. Microstructure of the alloys was analyzed by SEM, EDX and optical microscope （OM）. The effect of heat treatment on high vacuum die-casting （HVDC） GW63K alloy was also studied. The results indicate that with the increase of fast velocity, the tensile yield strength hardly changes, but the elongation first increases, then decreases. The optimum heat treatment process is solution treatment at 748 K for 2 h and aging at 473 K for 80 h. Under this condition, GW63K magnesium alloy exhibits a maximum tensile strength and elongation of 308 MPa and 9.45%. There is significant correlation between ductility and the presence of external solidified cells （ESCs）. The as-cast GW63K alloy consists ofα-Mg and Mg24（Gd,Y）5 particles. After heat treatment, Gd and Y atoms dissolve intoα-Mg matrix.

Adsorption onto Activated Carbon Fiber Cloth and Electrothermal Desorption of Volatile Organic Compound(VOCs):A Specific Review

A general research program, focusing on activated carbon fiber cloths （ACFC） and felt for environmental protection was performed. The objectives were multiple： （i） a better understanding of the adsorption mecha- nisms of these kinds of materials; （ii） the specification and optimization of new processes using these adsorbents; （iii） the modeling of the adsorption of organic pollutants using both the usual and original approaches; （iv） applications of ACFC in industrial processes. The general question was： how can activated carbon fiber cloths and felts be used in air treatment processes for the protection of environment. In order to provide an answer, different approaches were adopted. The materials （ACFC） were characterized in terms of macro structure and internal porosity. Specific studies were performed to get the air flow pattern through the fabrics. Head loss data were generated and modeled as a fi.mction of air velocity. The performances of ACF to remove volatile organic compounds （VOCs） were approached with the adsorption isotherms and breakthrough curves in various operating conditions. Regenera- tion by Joule effect shows a homogenous heating of adsorber modules with rolled or pleated layers. Examples of industrial developments were presented showing an interesting technology for the removal of VOCs, such as dichloromethane, benzene, isopropyl alcohol and toluene, alone or in a complex mixture.

Engineering vacancies for solar photocatalytic applications

In contrast to the exploration of novel photocatalytic materials,vacancy engineering of traditionalphotocatalysts comprising earth‐abundant elements represents an effective method for enhancingphotocatalytic performance without introducing alien elements.This minireview analyzes the latestprogress in engineering vacancies in photocatalysts,remarks on state‐of‐the‐art characterizationtechniques for vacancies,and reviews the formation chemistry and fundamental benefits of anionand cation vacancies in typical photocatalysts.Although knowledge of these vacancies is increasing,challenges remain in this field,and possible further research is therefore also discussed.