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Search Results: 1 - 10 of 41026 matches for " Lei Zhu "
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Encoding Organizational Source and Associative Source under Incidental and Intentional Learning Conditions  [PDF]
Lei Zhu
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.49096
Abstract:

The present study aimed at providing a plausible answer for the controversy whether organizational source or associative source could be encoded in a more automatic manner through incidental learning. In the experiment, subjects were asked to learn organizational and associative sources under incidental or intentional learning conditions. It turned out that only associative source accuracy increased when subjects were instructed to intentionally learn that source, which implied that associative source might be encoded in a more effortful way, whereas processing of organizational source might be performed incidentally.

Fuzzy Complex Index in Water Quality Assessment of Municipalities  [PDF]
Lei Zhu, Han Hu
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.29095
Abstract: Donghu Lake in Wuhan is a multipurpose complex water body. However, its eutrophication phenomenon becomes increasingly serious. By making use of detailed and accurate contamination monitoring data and several mathematics models, we probe into the dynamic state of water quality. The year’s average value of major contamination index in Donghu Lake from 2001 to 2008 and fuzzy complex index are used to assess its short-term state of water quality. The results show that its water quality is basically stable in the 4th class of water quality standard GB3838-2002.
Thinking of Personnel Training Mode to Enhance the Employment Competence of Civil Engineering  [PDF]
Ping Zhu, Lei Zhang
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37B040
Abstract:

In this article, with the goal of improving civil engineering students’ employability and establishing the \"five-in-one\" application-oriented talents cultivation mode of civil engineering specialty, We do the research primarily from professional practice in education, career planning, job skills training, alumni resources construction and enterprise feedback, in research at home and abroad on the basis of successful experience and practice, combined with the current civil engineering students in our actual situation, existing advantages into full play and accumulate, and put forward the \"five-in-one\" new training mode.

Craniometrical Studies on the Skull of Tibetan Gazelle (Procapra Picticaudata)
Zhu,Lei;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000100035
Abstract: a total of 10 skulls of tibetan gazelle were utilized in this study. craniometric measurements for 22 different parts of the skull were made. skull indices and ratios were calculated. a skull index of 43.22±0.44, a cranial index of 58.37±0.80 and a facial index of 116.37±1.24 were obtained.
Aesthetic Quality in Theatre as a Genre of Performance
Lei Zhu
International Journal of English Linguistics , 2012, DOI: 10.5539/ijel.v2n5p55
Abstract: The specific qualities of theatre distinguish itself from any other literary genres. As a theatre presupposes performance, undoubtedly then, it must contain the factors that make it playable. The aesthetic constitution of a theatre and the characteristics of theatrical discourse, which, together with the aesthetic quality of theatre as a branch of literature, make the total charm of a piece of theatrical creation.
Craniometrical Studies on the Skull of Tibetan Gazelle (Procapra Picticaudata) Estudios Craneométricos en el Cráneo de la Gacela del Tibet (Procapra Picticaudata)
Lei Zhu
International Journal of Morphology , 2012,
Abstract: A total of 10 skulls of Tibetan gazelle were utilized in this study. Craniometric measurements for 22 different parts of the skull were made. Skull indices and ratios were calculated. A skull index of 43.22±0.44, a cranial index of 58.37±0.80 and a facial index of 116.37±1.24 were obtained. Un total de 10 cráneos de gacela tibetana se utilizaron en este estudio. Mediciones craniométricos para 22 diferentes partes de los cráneos fueron realizadas. Los índices craneales y sus razones fueron calculadas. Un índice de cráneo de 43,22 ± 0,44, un índice craneal de 58,37 ± 0,80 y un índice facial de 116,37 ± 1,24 se obtuvieron.
Giles’ Choices in His English Translation of Liao Zhai
Lei Zhu
English Language and Literature Studies , 2012, DOI: 10.5539/ells.v2n4p39
Abstract: The paper aims to investigate the issue of ideology and poetics as a form of control over translator which results in the manipulation or rewriting of the source text(s) by analyzing Herbert A. Giles' English translation of Liaozhai. Giles is a great sinologist, who published the first edition of Strange Stories from a Chinese Studio in 1880, during the Victorian era. He left out many stories that were erotic or which were viewed as offensive. He chose to rewrite the sexual descriptions and remove the author's notes after the stories. The choices he made in translating this Chinese classic works is the result of the prevailing political and moral values and predominating poetics standards of the Victoria Age. Translation is a cross-cultural activity which takes place in real socio-political and economic situations where people may have significant interests in the production or reproduction of a specific text in a given community. Translators may face a great deal of pressure in their work in terms of quality standards, faithfulness, ideology and poetics. Therefore, translation may be subjected to several conscious acts of selection, addition or omission.
The sharp lower bound for the volume of 3-folds of general type with χ(\Co{X})=1
Lei Zhu
Mathematics , 2007,
Abstract: Let $V$ be a smooth projective 3-fold of general type. Denote by $K^{3}$, a rational number, the self-intersection of the canonical sheaf of any minimal model of $V$. One defines $K^{3}$ as a canonical volume of $V$. The paper is devoted to proving the sharp lower bound $K^{3}\ge {1/420}$ which can be reached by an example: $X_{46}\subseteq \mathbb{P}(4,5,6,7,23)$.
The Roles of Several Residues of Escherichia coli DNA Photolyase in the Highly Efficient Photo-Repair of Cyclobutane Pyrimidine Dimers
Lei Xu,Guoping Zhu
Journal of Nucleic Acids , 2010, DOI: 10.4061/2010/794782
Abstract: Escherichia coli DNA photolyase is an enzyme that repairs the major kind of UV-induced lesions, cyclobutane pyrimidine dimer (CPD) in DNA utilizing 350–450?nm light as energy source. The enzyme has very high photo-repair efficiency (the quantum yield of the reaction is ~0.85), which is significantly greater than many model compounds that mimic photolyase. This suggests that some residues of the protein play important roles in the photo-repair of CPD. In this paper, we have focused on several residues discussed their roles in catalysis by reviewing the existing literature and some hypotheses. 1. Introduction The sun gives warmth and light to the living beings on the earth. However, the ultra-violet (UV) radiation in the sunlight stimulates lesions forming in DNA. The UV-induced lesions in DNA block the replication and transcription events in the living cells, cause growth delay, mutagenesis, or lethal effects to organisms [1]. In order to survive under the sunlight, the organisms have evolved several repair mechanisms to resist the harmfulness of UV. Direct reversal by DNA photolyases is one of the mechanisms. There are two types of DNA photolyases, CPD photolyases and (6-4) photolyases, which, respectively, reverse the two major UV-induced lesions in DNA, cyclobutane pyrimidine dimers (CPD), and (6-4) photoproducts, utilizing blue or near-UV light (350–450?nm) as energy source [1–4]. CPD photolyases can be further categorized into two subclasses, class I (microbial) and class II (animal and plant), based on their amino acid sequence similarity [3, 5, 6]. Flavin adenine dinucleotide (FAD) is catalytic cofactor of all photolyases [3]. And a second cofactor, usually a derivative of folate, deazaflavin or flavin, acts as a photoantenna to increase the repair efficiency of the enzymes under limiting light conditions [3, 7–9]. The repair reactions are proposed through a photon-induced electron transfer mechanism which is supported by many model compounds studies. However, the quantum yields ( = 0.7–0.98) in the repair of pyrimidine dimers by DNA photolyase is significantly higher [3, 10–13] than those model compounds ( = 0.016–0.4) [14–16]. These results indicate that some amino acid residues of photolyases play important roles in the repair reactions. Escherichia coli DNA photolyase is a representative of them. By reviewing the existing literature and some hypotheses, we discussed the roles of some residues of E. coli photolyase in the highly efficient catalysis. This paper would provide the further insights into the catalytic mechanism of the enzyme. 2.
Gaussian Pulse-Based Two-Threshold Parallel Scaling Tone Reservation for PAPR Reduction of OFDM Signals
Lei Guan,Anding Zhu
International Journal of Digital Multimedia Broadcasting , 2011, DOI: 10.1155/2011/470310
Abstract: Tone Reservation (TR) is a technique proposed to combat the high Peak-to-Average Power Ratio (PAPR) problem of Orthogonal Frequency Division Multiplexing (OFDM) signals. However conventional TR suffers from high computational cost due to the difficulties in finding an effective cancellation signal in the time domain by using only a few tones in the frequency domain. It also suffers from a high cost of hardware implementation and long handling time delay issues due to the need to conduct multiple iterations to cancel multiple high signal peaks. In this paper, we propose an efficient approach, called two-threshold parallel scaling, for implementing a previously proposed Gaussian pulse-based Tone Reservation algorithm. Compared to conventional approaches, this technique significantly reduces the hardware implementation complexity and cost, while also reducing signal processing time delay by using just two iterations. Experimental results show that the proposed technique can effectively reduce the PAPR of OFDM signals with only a very small number of reserved tones and with limited usage of hardware resources. This technique is suitable for any OFDM-based communication systems, especially for Digital Video Broadcasting (DVB) systems employing large IFFT/FFT transforms. 1. Introduction Orthogonal Frequency Division Multiplexing (OFDM) is one of the most popular modulation schemes employed in modern wireless communication systems, such as DVB (Digital Video Broadcasting), WiMAX (Worldwide Interoperability for Microwave Access), and LTE (Long Term Evolution). OFDM offers many advantages, including high spectral efficiency, supporting high data rates, and tolerance to multipath fading [1]. Unfortunately, OFDM signals often have a high Peak-to-Average Power Ratio (PAPR) due to the summation of many independent subcarrier-modulated signals with random phases. High peaks occur very rarely, but the power amplifier (PA) in the transmitter may be overdriven deep into saturation on these rare occurrences, which can result in very high instantaneous spectral regrowth that causes interferences to other users. To prevent such phenomena, the PA must be “backed-off” into its linear region from the saturation point by approximately the PAPR level of the input signal, which consequently leads to very low power efficiency of the transmitter. PAPR reduction techniques are proposed to reduce the high peaks of the transmit signal to a satisfactory level before transmission, allowing the PA to be operated at a higher power level to achieve high power efficiency without
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