利用代数性质探索几何命题辅助线的添作

许多几何命题的结论是一些线段的代数式,经过分析,并利用代数式的一些性质,常常有助于发现辅助线的添作和证题思路。下面从几个类型举例说明。一、证明形如ab=cd±ef的线段代数式例1 在△ABC中,已知∠A=2∠B。求证:BC^2=AC^2+AC·AB。分析一要证的结论左边是单项式,右边是二项式。从代数的观点看,BC可分成两部分。如BC=x+y。

Apriori and N-gram Based Chinese Text Feature Extraction Method

A feature extraction, which means extracting the representative words from a text, is an important issue in text mining field. This paper presented a new Apriori and N-gram based Chinese text feature extraction method, and analyzed its correctness and performance. Our method solves the question that the exist extraction methods cannot find the frequent words with arbitrary length in Chinese texts. The experimental results show this method is feasible.

要真心实意地把知识分子当成工人阶级一部分

当前,如何继续抓紧落实党的知识分子政策,解决好正确对待知识分子的问题,充分发挥知识分子在四化中的骨干作用,仍是非常重要而迫切的一个问题。 粉碎“四人帮”以后,推翻了“两个估计”,邓小平付主席代表党中央在全国科技大会上又宣布知识分子是工人阶级的一部分,特别是三中全会以后,党的知识分子政策逐步的得到了贯彻落实。广大知识分子和全国人民是很高兴的。但是,由于林彪“四人帮”十多年来推行的极左路线所造成的流毒匪浅。

Unified Framework of Performing Chinese Word Segmentation and Part-of-Speech Tagging

The paper proposes a unified framework to combine the advantages of the fast one-at-a-time approach and the high-performance all-at-once approach to perform Chinese Word Segmentation(CWS) and Part-of-Speech(PoS) tagging.In this framework,the input of the PoS tagger is a candidate set of several CWS results provided by the CWS model.The widely used one-at-a-time approach and all-at-once approach are two extreme cases of the proposed candidate-based approaches.Experiments on Penn Chinese Treebank 5 and Tsinghua Chinese Treebank show that the generalized candidate-based approach outperforms one-at-a-time approach and even the all-at-once approach.The candidate-based approach is also faster than the time-consuming all-at-once approach.The authors compare three different methods based on sentence,words and character-intervals to generate the candidate set.It turns out that the word-based method has the best performance.

Advances in TCM Treatment of Primary Hepatocarcinoma

Characterized by insidious onset,fast progress,wide epidemic with poor therapeutic effect and shortsurvival period,primary hepatocarcinoma is one ofthe malignant tumors that threatens the human health.Rich experiences and gratifying achievements havebeen obtained by Chinese medical workers.

An Analysis of Therapeutic Effect of Drug Acupoint Application in 209 Cases of Allergic Asthma

Both therapies of traditional crude herb moxibustion and drug acupoint application were used in 209 cases of allergic asthma to compare their long-term and short-term therapeutic effects and to analyze the relationship between clinic therapeutic effects of both therapies and differential types of the disease. The results showed that the short-term total effective rate in the group of drug acupoint application was higher than that in the group of traditional crude herb moxibustion, the therapeutic effects of drug acupoint application being closely related to differential types. Analysis also shows the best short-term therapeutic effect was in the type of heat in the lung while the poorest effect in the type of deficiency of the kidney-yang.

Algorithm study of transient response of vertical magnetic bipolar source in whole space plane layered medium

For some time, whole space feature as a theoretical problem has been a puzzle in mining transient electromagnetic method （TEM）. We have introduced a detailed method of calculating the transient response of a vertical magnetic bipolar source in a whole space plane layered medium in order to obtain whole space features. After designing a whole space plane layered medium model, equations were established based on boundary conditions in terms of electromagnetic vector potential. Expressions of electromagnetic fields were obtained by solving these equations. The expressions were computed by the Hankel transform after dispersion. The results in a frequency domain were changed into a time domain by using a multinomial cosine transform method. The expressions were correctly validated by comparing them with the analytical solution in half space. The half space and whole space results show that the whole space features are dear, suggesting that the theory of half space is not suitable for the whole space. Our algorithm supplied the technical instrument for studying the distributed features of whole space transient electromagnetic fields.

APPLICATION OF ANALYTIC HIERARCHY PROCESS TO ASSESSING THE ECOLOGICAL VULNERABILITY OF WETLANDS IN THE JIANGHAN PLAIN

Wetlands in the Jianghan Plain are important components of wetland types in lake area in the middle and lower reaches the Changjiang (Yangtze) River and they fulfill many uses and functions related to hydrology, waste assimilation, ecosystem productivity and biodiversity. Owing to natural factors and human activities, especially excessive reclamation from lakes, the shrinking process of the lakes has been accelerated. Wetland ecosystem has shown the characteristics of vulnerability. According to the analysis of wetland ecological function in the Jianghan Plain, this paper presented an index system related to productivity, stability and environmental capacity. By using the method of Analytic Hierarchy Process, we computed the values of the relative weights of the indexes, and evaluated the vulnerability level of the wetland ecosystem by the method of multi-indexes. The case study showed that the fragile extent of wetland ecosystem in the Jianghan Plain is 5.6. This means that the wetland ecosystem in the Jianghan Plain is laid to the state of middle vulnerability. Therefore, the wetland conservation and eco-rehabilitation in the Jianghan Plain should be paid attention to.

Two-stage approach to full Chinese parsing

Natural language parsing is a task of great importance and extreme difficulty. In this paper, we present a full Chinese parsing system based on a two-stage approach. Rather than identifying all phrases by a uniform model, we utilize a divide and conquer strategy. We propose an effective and fast method based on Markov model to identify the base phrases. Then we make the first attempt to extend one of the best English parsing models i.e. the head-driven model to recognize Chinese complex phrases. Our two-stage approach is superior to the uniform approach in two aspects. First, it creates synergy between the Markov model and the head-driven model. Second, it reduces the complexity of full Chinese parsing and makes the parsing system space and time efficient. We evaluate our approach in PARSEVAL measures on the open test set, the parsing system performances at 87.53% precision, 87.95% recall.

DTNBP1 Gene Is Associated with Some Symptom Factors of Schizophrenia in Chinese Han Nationality

Objective To study the association of DTNBP1 gene with some symptom factors of schizophrenia.Methods A total of 285 unrelated schizophrenic individuals were recruited from December 2004 to January 2009 for genetic analysis,and their symptom factors were assessed based on the Positive and Negative Syndrome Scale(PANSS).The quantitative trait test was performed by the UNPHASED program(version 3.0.12) to investigate the association between scored positive and negative symptoms and the single nucleotide polymorphisms(SNPs) in DTNBP1 gene.Results The quantitative trait test showed allelic association of rs909706 with the excitement symptom of schizophrenia(P<0.05,adjusted by 10 000 permutations),while the genotype C/G of rs2619539 with a negative symptom,lack of spontaneity and flow of conversation(P<0.05,adjusted by 10 000 permutations).Conclusion DTNBP1 variations are possibly associated with some symptoms of schizophrenia,which could partly explain the relationship between the susceptibility gene DTNBP1 and that disease.

Failure Modes for Single-Layer Reticulated Domes Under Impact Loads

The paper presents the theory of Hamilton variation principle which is the current method for impact problem, central difference method which is efficient solution of finite element (FE) method for impact problem and adapts to solve non-linear dynamic problem. And it introduces the ANSYS/LS-DYNA which is the popular FE software for impact problem both at home and abroad. Then it gives solutions for one simple model by analytical method and ANSYS/LS-DYNA respec-tively to validate function of software, and they are consistent. Afterward, it gives model of single-layer Kiewitt reticulated dome with a span of 60 m, and the cylinder impactor, and introduces the contact interface arithmetic, especially the material model of steel (piecewise linear plasticity model) which takes stain rate into account and makes steel failure stress higher under impact loads. The vertical displacement, stress in main members, and the plastic deformation for dome under impact loads were obtained. Then four failure modes (no failure, moderate failure, global failure and slight failure) were summarized according to the rules of dynamic response. And the characteristics of dynamic response for each failure mode were shown.

In Vivo Kinetics and Biodistribution of a Hantaan Virus DNA Vaccine after Intramuscular Injection in Mice

To study the kinetics in vivo of a Hantaan virus DNA vaccine, we constructed a fusion DNA vaccine, pEGFP/S, by cloning the S segment of Hantavirus into the vector, pEGFP-C1, which encodes Green fluorescent protein EGFP. In this report, we provide evidence that pEGFP/S was distributed and persistently expressed for more than 60 days in several organs after inoculation. Our findings suggest that the persistent immune responses induced by a Hantaan virus DNA vaccine are likely due to the plasmid pEGFP/S deposited in vivo, which acts as a booster immunization.

A GIS-based Spatial Analysis of Housing Price and Road Density in Proximity to Urban Lakes in Wuhan City, China

As one of the essential urban open spaces, lakes usually contribute immensely to the quality of residents′ daily lives. Different from hedonic approach employed in existing researches on urban open spaces in China, this paper integrates housing price surface with road density to analyze the spatial characteristics in proximity to urban lakes in Wuhan City, China. With the expansion of Wuhan City, urban lakes became polluted, they shrunk or even disappeared, leading to unfavorable conditions for sustainable development of the city. To better understand the spatial relationship between the city and lakes, we classify the urban lakes in Wuhan central area into ′lakes in the urban center′ and ′lakes in urban fringe′. Based on housing price surface we explore the spatial characteristics in proximity to different lakes and differences between the lakes. We also use Geographic Information System(GIS) tool to calculate road density as a supplementary indicator to reflect the accessibility in proximity to urban lakes. The results indicate that relative independence exists between different towns, and the spatial characteristics are different depending on scales and locations. In most of cases, the road density is lower where closer to the lakeshore while the housing price exhibits an opposite pattern. We conclude that city governments and urban planners should give more considerations to these spatial differences, somewhere should be better planned and protected as an important waterfront and somewhere the control of unreasonable real estate development nearby should be strengthened.

Functional Divergences of Left Dislocation Construction in English and Chinese

This paper attempts to explore the functional divergence of LD （Left Dislocation） in English and Chinese. Through detailed analyzing, we find that LD in both languages shares only one function, the function of simplifying, but it is different in other functions and there are eight more functions in Chinese than in English. The interface study of LD in the two languages leads to the implications： The connections between syntactic form and discourse function are language-specific and arbitrary, and LD serves a wide variety of discourse functions and is motivated by a range of discourse circumstances

A Corpus-Based Study on the Acquisition of the Modal Adverb Fanzheng by Foreign Learners of Chinese

This study investigates foreign learners＇ acquisition of the Chinese modal adverb fanzheng on the basis of interlanguage corpus. We find that the sentences written by foreign learners of Chinese （hereafter simplified as FLC） with the wordfanzheng are quite similar to those by Chinese native speakers in the distribution of the syntactic categories, semantic types, semantic functions, pragmatic or discourse functions. These characterize basically the wordfanzheng as one of the modal adverbs in such three aspects as syntax, semantics and pragmatics. Most of the FLCs study the basic meanings and typical contexts of the wordfanzheng at primary stage, and later the functions emphasizing reasons, summary or explaining, and then the function of textual cohesion at the intermediate and advanced stage. The main causes of errors reflect that the FLCs are not able to differentiate the usage offanzheng and that of other causal or adversative conjunctions.

Advances in TCM Symptomatology of Rheumatoid Arthritis

In view of the rich experiences and new advances in TCM treatment of rheumatoid arthritis, it is very promising to find a further breakthough in the field of traditional Chinese medicine (TCM). Treating the disease by means of differentiation of symptoms and signs is a distinctive feature of TCM, however the difficult and also the major point would be the research of mechanism of its symptomatology. The following is a summary of the advances in the study of symptomatology, especially its epidemiology, the role of immune system and blood rheology made since 1987 when the ARA criteria1 was published.……

Treating Principles and Methods of Traditional Chinese Medicine in Treatment of Peripheral Vascular Diseases

Peripheral vascular disease embraces a variety of conditions such as thromboangiitis obliterans, Raynaud's disease, thrombophlebitis, aorto-arteritis, obliterate atherosclerosis, varix or phlebothrombosis of the lower limb. Although the affected blood vessel may be arterial or venous one and caused either by inflammation or degenerate changes, they share common symptoms and signs, such as blood stasis, ischemia, thrombosis, ecchymosis, swelling, constriction or obliteration of blood vessels due to circulatory impairment. Since they share common characteristics, the treating principles and methods will be discussed as follows.

A lexicalized second-order-HMM for ambiguity resolution in Chinese segmentation and POS tagging

Hidden Markov Model（HMM） is a main solution to ambiguities in Chinese segmentation anti POS （part-of-speech） tagging. While most previous works tot HMM-based Chinese segmentation anti POS tagging eonsult POS informatiou in contexts, they do not utilize lexieal information which is crucial for resoMng certain morphologieal ambiguity. This paper proposes a method which incorporates lexieal information and wider context information into HMM. Model induction anti related smoothing technique are presented in detail. Experiments indicate that this technique improves the segmentation and tagging accuracy by nearly 1%.

The Principle and Technique of Using Chinese Drugs in the Treatment of Hypertension

Differential use of Chinese and western drugs, and combination of traditional theory of materia medica with the results of modern pharmacological research can be regarded as a general principle in the treatment of a disease, while combination of lowering blood pressure with preventing and treating complications is a specific method in the treatment of hypertension. As to the use of drugs based on differentiation of diseases and/or symptoms, drugs which have the action of relieving symptoms but also reducing blood pressure should be used as the first choice. For those drugs which have the action of relieving symptoms but can not lower blood pressure should not be used or should be used as less as possible. Drugs with action of raising blood pressure are contraindicated. When patients have the symptoms of hyperactivity of yang resulting from yin deficiency, Huang Bo ([symbol: see text] Cortex Phellodendri) and Zhi Mu ([symbol: see text] Rhizoma Anemarrhenae) are used together to enhance the effects of both nourishing yin to reduce pathogenic fire, and reducing blood pressure. This practice conforms to the TCM theory and also to the modern pharmacological research.