状态方程的约当化方法与分析

在自动控制及计算机应用研究中往往遇到提出的不用特征向量,直接根据方阵A的特征值的代数重数、退化度和其特征值指数构造其相似约当阵,再根据线性变换关系求出变换阵P,进而对状态方程进行约当化的方法,经理论和实践证明,该方法简单有效。

矩阵约当化方法的研究

作者研究了矩阵约当化的简化方法,指出并证明了矩阵约当化与对角化的充要条件。只要根据约当子块的数目及其维数,即可写出约当形矩阵,而不必求出变换矩阵,从而也不必求特征向量和广义特征向量。

甘肃永登连城鲁土司历史文化资源在当代旅游发展中的重大意义

甘肃永登连城鲁土司统治连城长达五百六十多年,留下了弥足珍贵的历史文化资源,是当地发展旅游业的宝贵财富。作者根据鲁土司历史文化资源的特点,把它作为一种宝贵的人文历史旅游资源来挖掘,并对其提出旅游开发的战略构想。

当归六黄汤加减联合化痰祛瘀调瘿方对甲状腺功能亢进症患者TR-Ab、TPOAb表达的影响

目的研究当归六黄汤加减联合化痰祛瘀调瘿方对甲状腺功能亢进症患者促甲状腺激素受体抗体(TR-Ab)、甲状腺过氧化物酶抗体(TPOAb)表达的影响。方法选取2019年1月—2021年1月在医院就诊的甲状腺功能亢进症患者148例,根据治疗方法的不同分为当归六黄汤组和联合组,各74例。当归六黄汤组给予当归六黄汤加减治疗,联合组在当归六黄汤组用药的基础上给予化痰祛瘀调瘿方治疗,两组均持续治疗8周。检测患者在治疗前及治疗4周、8周后TR-Ab、TPOAb表达水平。结果两组治疗后4周、8周TR-Ab、TPOAb、T_(3)、T_(4)、FT_(3)、FT_(4)、Vm水平及甲状腺肿大、突眼、心悸心慌、多食易饥评分低于两组治疗前,RI、PI水平高于两组治疗前(P<0.05)。联合组治疗后4周、8周TR-Ab、TPOAb、T_(3)、T_(4)、FT_(3)、FT_(4)、Vm水平及甲状腺肿大、突眼、心悸心慌、多食易饥评分低于当归六黄汤组4周、8周,RI、PI水平高于当归六黄汤组4周、8周(P<0.05)。与当归六黄汤组相比,联合组治疗总有效率升高(P<0.05)。结论当归六黄汤加减联合化痰祛瘀调瘿方能够改善甲状腺功能亢进症患者TR-Ab、TPOAb表达水平,缓解患者临床症状,疗效显著。

ANALYSIS FOR AIRCRAFT TAXIING AT VARIABLE VELOCITY ON UNEVENNESS RUNWAY BY THE POWER SPECTRAL DENSITY METHOD

In this paper a novel approach for the analysis of non stationary response of aircraft landing gear taxiing over an unevenness runway at variable velocity is explored, which is based on the power spectral density method. A concerned analytical landing gear model for simulating actual aircraft taxiing is formulated. The equivalent linearization results obtained by probabilistic method are inducted to treat landing gear non linear parameters such as shock absorber air spring force, hydraulic damping and Coulomb friction, tire stiffness and damping. The power spectral density for non stationary analysis is obtained via variable substitution and then Fourier transform. A representative response quantity, the overload of the aircraft gravity center, is analyzed. The frequency response function of the gravity overload is derived. The case study demonstrates that under the same reached velocity the root mean square of the gravity acceleration response from constant acceleration taxiing is smaller than that from constant velocity taxiing and the root mean square of the gravity acceleration response from lower acceleration taxiing is greater than that from higher acceleration.

Chemical Constituents of Angelica sinensis

Aim To investigate the active constituents responsible for thepharmacological activities of Angelica sinensis (Oliv) Diels. Methods Chromatography was used toisolate chemical components, and spectroscopy was used to identify their structures. Results Sevencompounds were isolated and their structures were identified as ferulic acid (1), conife-rylferukte(2) , bis (2-ethylhexyl) phthalate (3), dibutyl phthalate (4), lignoceric acid (5), palmitic acid(6), and Z-6, 7-cis-dihydroxyligustilide (7) Conclusion Bis (2-ethylhexyl) phthalate and dibutylphthalate were obtained from Angelica sinensis for the first time.

老友乐泉及他的诗,书,画

乐泉的名头似乎很是不小了。我每次出门遇上能挥洒一阵,或刻上几刀的人,不管对他是贬是褒,都能提及他。杂志、报纸,也时见其端。为他作品题记的人不少,我见过沙曼翁为他作记的文字手稿。还有:谢稚柳、王蘧常、钱君匋、王个簃、唐云、林散之、吴丈蜀,健在的亚明等等。

Preparation and properties of pitch carbon based supercapacitor

Using the mesophase pitch as precursor, KOH and CO2 as activated agents, the activated carbon electrode material was fabricated by physical-chemical combined activated technique for supercapacitor. The influence of activated process on the pore structure of activated carbon was analyzed and 14 F supercapacitor with working voltage of 2.5 V was prepared. The charge and discharge behaviors, the properties of cyclic voltammetry, specific capacitance, equivalent serials resistance （ESR）, cycle properties, and temperature properties of prepared supercapacitor were examined. The cyclic voltammetry curve results indicate that the carbon based supercapacitor using the self-made activated carbon as electrode materials shows the desired capacitance properties. In 1 mol/L Et4NBF4/AN electrolyte, the capacitance and ESR of the supercapacitor are 14.7 F and 60 mΩ respectively, The specific capacitance of activated carbon electrode materials is 99.6 F/g; its energy density can reach 2,96 W.h/kg under the large current discharge condition, There is no obvious capacitance decay that can be observed after 5000 cycles, The leakage current is below 0,2 mA after keeping the voltage at 2.5 V for l h, Meanwhile, the supercapacitor shows desired temperature property; it can be operated normally in the temperature ranging from -40 ℃to 70 ℃,

Improved seismoacoustic analysis model and its application to source parameter inversion of near-surface small-yield chemical explosions

The seismoacoustic analysis method has broad potential applications to source parameter estimation for near-surface explosion events such as industrial explosions and terrorist attacks.In this study,current models were improved by modifying the acoustic model and adopting the Bayesian Markov-chain-Monte-Carlo inversion method.The source parameters of near-surface small-yield chemical explosions were analyzed via the improved seismoacoustic analysis model and by the estimation accuracy of seismoacoustic joint inversion.Estimation and analysis results showed that the improved seismoacoustic analysis model considered ground shock coupling and the impact of explosion products ejecting from the surface so that the improved acoustic impulse relation was more consistent with the measured data than the Ford impulse relation.It is suitable for deep-burial,shallow-burial,and near-surface aerial explosions.Furthermore,trade-off relationships were declined through the application of the improved model to source parameter inversion for near-surface small-yield chemical explosions,and source parameter estimation accuracy was improved.

Determination of constituents of essential oil from Angelica sinensis by gas chromatographymass spectrometry

Gas chromatographymass spectrometry (GC-MS) coupled with chemometric resolution upon two- dimensional data was employed to analyze the constituents of essential oils of Angelica sinensis. Constituents in essential oils of Angelica sinensis root were identified by GC-MS with the help of subwindow factor analysis (SFA) method resolving two-dimensional original data into mass spectra and chromatograms. 76 of 97 separated constituents in essential oil of Angelica sinensis root were identified and quantified, and they account for about 91.36% of the total content. The results show that ligustilide, butylene phthalide, 2-methoxy-4-vinylphenol, carvacrol, allo-ocimene,2,6,6-trimethylbicyclo-[3,1,1]hept-2-ene are the main constituents in essential oil of Angelica sinensis root.

China's Urbanization in 1949–2015: Processes and Driving Forces

The pace and scale of China＇s contemporary urbanization are stunning. This paper reviews process and the underlying driving forces of China＇s urbanization between 1949-2015. Contemporary China＇s urbanization has experienced four stages, and each has had different driving forces： 1） economic re-construction and industrialization-led urbanization 0949-1977）; 2） economic reform and mar- ket-led urbanization （1978-1995）; 3） economic globalization and the global-local urbanization （1996-2010）; and 4） the land-economy- led urbanization （2010-）. These urbanization processes and driving forces will undoubtedly provide scientific reference and have sig- nificant implications for developing countries, especially African countries, to formulate their urbanization public policies.

Cultural Connotation and Contemporary Value of Japanese Garden

Culture is the soul of a nation, and also the basis of landscape design, the basis of historical inheritance and innovation. Japanese garden was born out of Chinese garden, but because of the difference of geographical environment and national culture, Japanese gardens combine Chinese culture with local national characteristics, forming a unique garden culture in Japan. Based on the research on Japanese gardens like pond garden, rock garden and tea garden, this study analyzed the cultural connotation in Japanese garden landscape design, made in-depth understanding of Japanese landscape development, explored the value existing in the contemporary garden design of Japanese gardens, with the aim to make use of the excellent experience to the garden landscape design in the future.

Applicable Scope of Equity Theory and Reaction on Productivity under the Influence of Traditional Culture

Equity theory was proposed by John.Stacey.Adams. Under the background in China, nor matter the staff in state owned enterprises with better pay or the compliant workers feel unfair remuneration. Is the unfairness objective reality or caused by special cultural environment in China？ The paper deeply observes the inapplicability of equity theory in China and reaction of it on productivity.

Solid Waste Minimization Case Study at an Automotive Supplier with an Emphasis on Urethane Recycling

In the extremely competitive world of business and manufacturing, solid waste disposal is often overlooked. There are associated costs with excess raw materials, scrap parts, poor use of resources, and outdated materials. All of these contribute to a company＇s solid waste stream, and must be addressed when calculating the costs of disposal. In addition, it is not ecologically or economically sound decision to allow recyclables to enter landfills. Waste analysis and minimization can be very financially advantageous to companies and should be evaluated. This paper discusses a methodology and a case study that uses a solid waste audit process with a focus on urethane recycling.

Simulation and Optimization Design Based on Adams Engine Mounting System

The content of this subject research is to conduct optimization for engine mounting system, and through optimization, it can make the vibration between engine and vehicle body achieve a minimum, using Adams software for simulation. It studies the isolation vibration of the engine mounting system and conducts goal optimization for fixed frequency. This paper uses two methods for optimization. One is to use the rational allocation of fixed frequency to optimize the fixed frequency, and the other is to use energy decoupling method to optimize the fixed frequency. It uses Adams software for simulation of the optimized fixed frequency and conducts comparison of simulated results. The simulated results show that the optimized energy distribution situation almost achieves 90%. Compared with original data, decoupling degree also has a very great improvement, illustrating that the optimized data has greater effect for the isolated vibration of engine, in order to further verify the feasibility of optimization design method.

Research on the Development Dilemma and Response Strategy of Contemporary Chinese Classical Dance

Chinese classical dance contains a profound connotation of Chinese traditional culture, with distinctive forms of performance and aesthetic characteristics. In the world of multi-cultttral communion, the development of Chinese classical dance needs to be inherited on the basis of traditional culture to inject more innovation, highlight its unique artistic aesthetic value and deep national culture contains. In this paper, the development course, aesthetic characteristics and classical dance form of Chinese classical dance are expounded. From the perspectives of historical cultural inheritance, classical dance culture cultivation and dance culture innovation, the feasibility measures and measures are put forward in order to explore the effective path and methods to developing Chinese classical dance, which gives excellent national dance art inheritance, development and innovation.

基于无线传感器网络定位技术的图书馆智能管理创新

"互联网+"时代,信息技术的发展对图书馆的智能化管理工作提出了更高的要求。文章概述了无线传感器网络与定位技术,重点讨论了如何将WSN定位技术运用到图书智能管理,通过定位技术与大数据、云计算等信息技术的结合,推动图书馆智能系统建设和智能化发展。

Three-dimensional cell culture models for investigating human viruses

Three-dimensional(3D) culture models are physiologically relevant, as they provide reproducible results, experimental flexibility and can be adapted for high-throughput experiments. Moreover,these models bridge the gap between traditional two-dimensional(2D) monolayer cultures and animal models. 3D culture systems have significantly advanced basic cell science and tissue engineering, especially in the fields of cell biology and physiology, stem cell research, regenerative medicine, cancer research, drug discovery, and gene and protein expression studies. In addition,3D models can provide unique insight into bacteriology, virology, parasitology and host-pathogen interactions. This review summarizes and analyzes recent progress in human virological research with 3D cell culture models. We discuss viral growth, replication, proliferation, infection, virus-host interactions and antiviral drugs in 3D culture models.

Three Paradigms in Lu Xun Research and Contemporary Value Options

Research on Lu Xun is never simply the analysis of an individual writer, but constitutes an understanding of the cultural attributes represented by Lu Xun himself and his writings. Likewise, the evaluation of research on Lu Xun is never a simple evaluation of academic history, but rather a social evaluation associated with the value orientations of those times. At present, with the return of academic logic and the growing tendency toward private research, a noteworthy divergence of standpoints and evaluations of Lu Xun research has emerged. At the same time, as a prominent discipline that has been over-interpreted, research on Lu Xun is demonstrating a tendency toward redundancy and triviality. Three fundamental paradigms are commonly employed in research on Lu Xun： historical research that attempts to explore historical materials; academic research that focuses on knowledge interpretation and aesthetic evaluation; and contemporary research that pursues the contemporary meaning and values of Lu Xun＇s ideas. Each paradigm offers an insight into and understanding of Lu Xun＇s rich and complex spiritual world; each presents a paradox of one kind or the other; and each performs different value functions.