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Search Results: 1 - 10 of 97279 matches for " YU Hui-min "
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The Design and Fabrication of Platform Device for Dna Amplification
Ch. -Heng Chien,Hui-Min Yu
Computer Science , 2007,
Abstract: Thermalcycler were extensively used machine for amplify DNA sample. One of the major problems in the working time was that it spent most of time for cooling and heating. In order to improve the efficient, this study presented a novel method for amplify DNA sample. For this concept, the DNA sample in the silicon chamber which was pushed by a beam through three temperature regions around a center and then the DNA segments could be amplified rapidly after 30 cycles. The polymerase chain reaction platform was composed of thin-film heaters, copper plates, DC powers, and temperature controllers. The photolithography and bulk etching technologies were utilized to construct the thin-film heater and DNA reaction chambers. Finally, 1 pound gL 100bp DNA segment of E. coli K12 was amplified successfully within 36 minutes on this PCR platform.
Programmed Cell Death in Plant
植物中的细胞程序性死亡

YU Hui-Min,
于惠敏

植物学报 , 1998,
Abstract: Programmed cell death (PCD) plays an important role in normal growth and development of plants, it presently has become one of hot points of researches on plants. In this review, we discuss recent studies on the features of PCD in plants including the changes in cell morphology and the processing of DNA, the evidences for PCD during vegetative and reproductive phase of plant development and the interactions of plant with environment, the moleocular mechinisms controlling PCD in plants including related signals, related proteins and related genes. We also suggest some questions to be further investigated and possible value of these studies.
PREPARATION OF MACROPOROUS CELLULOSE-BASED SUPERABSORBENT POLYMER THROUGH THE PRECIPITATION METHOD
Yu Chen,Yunfei Liu,Hui-Min Tan
BioResources , 2008,
Abstract: Superabsorbent polymer was prepared by graft polymerization of acrylic acid onto the chain of carboxymethyl cellulose. This superabsorbent polymer was further treated by the solvent precipitation method. We found that the water absorption rate of the treated polymer was greatly increased and the microstructure of the treated polymer was changed from close-grained structures to loose macropores. The swelling processes of the polymers before and after modification fit first-order dynamic processes. The amount of the residual acrylic acid detected through high performance liquid chromatography (HPLC) with aqueous solution of MOPS of 0.02mol/L (pH=5.70) as the mobile phase. It was found that the amount of the residual acrylic acid decreased from 83.8×10-4 % to 6.7×10-4 % after treatments.
Fabrication of Switches on Polymer-Based by Hot Embossing
Chao-Heng Chien,Hui-Min Yu
Computer Science , 2007,
Abstract: In MEMS technology, most of the devices are fabricated on glass or silicon substrate. However, this research presents a novel manufacture method that is derived from conventional hot embossing technology to fabricate the electrostatic switches on polymer material. The procedures of fabrication involve the metal deposition, photolithography, electroplating, hot embossing and hot embed techniques. The fundamental concept of the hot embed technology is that the temperature should be increased above Tg of polymer, and the polymer becomes plastic and viscous and could be molded. According to the fundamental concept, the metal layer on the silicon/glass substrate could be embedded into polymer material during the hot embossing process. Afterward, the metal layer is bonded together with the polymer after removing the substrate in the de-embossing step. Finally, the electrostatic switch is fabricated on polymethylmethacrylate(PMMA) material to demonstrate the novel method.
A Separating Algorithm for Overlapping Red Blood Cell Images
一种重叠红细胞图像的分离方法

YOU Yu-sai,YU Hui-min,
尤育赛
,于慧敏

中国图象图形学报 , 2005,
Abstract: 细胞图像中经常出现重叠(或者粘连)现象,利用红细胞是近似圆形的这一先验知识,用粒度测量来获取红细胞半径R,对重叠区域轮廓上的每个非凹陷点,估计其所对应的圆心点,这些圆心点聚集成各个细胞的中心区域,对每一个中心区域,采用半径为R的圆形结构元进行一次膨胀操作,然后和原二值图像进行交集运算,将其结果作为对各个细胞形状的估计。实验结果表明,该方法能得到比较满意的分离效果,亦适用于其他近似圆形的细胞或者颗粒的重叠区域图像的分离。
Syntheses and Crystal Structures of Two Transition Metal Complexes (M = Mn and Co) Containing Malonate and Reduced Imino Nitroxide Radicals
Jing Chen,You-Juan Zhang,Bing-Chang Qin,Hui-Min Zhu,Yu Zhu
International Journal of Inorganic Chemistry , 2011, DOI: 10.1155/2011/257521
Abstract: Two novel transition metal complexes with malonate and reduced imino nitroxide radicals, [Co(mal)(Him2-py)2] (ClO4) 1 and [Mn (mal)(Him2-py)2] (H2O) 2 (Him2-py = 1-hydroxy-2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline) have been synthesized and their crystal structures were determined by X-ray diffraction method. During the reaction, one-electron reduction of the N–O radical moiety in IM2py has been reviewed. The structural analyses reveal that two title complexes are isostructural and crystallize in monoclinic space group C2. For the complex , , , ? with . For the complex , , , ? with . In two complexes, the coordination number around the metal ion is six, and the coordination sphere is a distorted octahedron. Two nitrogen atoms from Him2-py and two oxygen atoms from malonate are in the basal plane, and two nitrogen atoms from pyridyl rings of Him2-py at the axial position. 1. Introduction The design and synthesis of transition metal complexes with organic free radicals is one of the major challenges in the field of molecular magnetic materials [1]. Nitronyl nitroxide (NN) radicals are normally used as spin carriers to the development of molecular-based magnetic materials. However nitroxides can undergo redox reactions with transition metal ions under certain conditions [2, 3]. In fact, nitronyl free radicals are in an oxidation state intermediate between those of the hydroxylamino anion and the nitrosonium cation. Up to now, relatively little work has been devoted to the study of the redox properties of metal-nitroxyl systems and only a few complexes containing metal ions bound to the reduced monoradical have been reported [4–9]. It is known that nitronyl nitroxide radicals can undergo redox reaction with transition metal ions, yielding complexes in which the IMHR reduced form of IM acts as a diamagnetic ligand [7]. In order to extend our knowledge of extremely rich chemistry of such systems, it is necessary to further explore the reactions between metal ion and nitronyl nitroxide radicals. In this paper, we will report that syntheses and structural characterization about two novel transition metal compounds with malonate and reduced imino nitroxide radicals, [Co(mal)(Him2-py)2] (ClO4) 1 and [Mn (mal)(Him2-py)2] (H2O) 2 (Him2-py = 1-hydroxy-2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline). 2. Experimental 2.1. Syntheses 2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl (im2-py) was prepared according to the methods reported [10]. [Co(mal )(Him2-py)2] (ClO4) 1: an aqueous solution (10?mL) of Na2(mal) (0.148?g,1?mmol) was added to a mixture of
A ±6?ms-Accuracy, 0.68?mm2, and 2.21?μW QRS Detection ASIC
Sheng-Chieh Huang,Hui-Min Wang,Wei-Yu Chen
VLSI Design , 2012, DOI: 10.1155/2012/809393
Abstract: Healthcare issues arose from population aging. Meanwhile, electrocardiogram (ECG) is a powerful measurement tool. The first step of ECG is to detect QRS complexes. A state-of-the-art QRS detection algorithm was modified and implemented to an application-specific integrated circuit (ASIC). By the dedicated architecture design, the novel ASIC is proposed with 0.68?mm2 core area and 2.21?μW power consumption. It is the smallest QRS detection ASIC based on 0.18?μm technology. In addition, the sensitivity is 95.65% and the positive prediction of the ASIC is 99.36% based on the MIT/BIH arrhythmia database certification. 1. Introduction Many healthcare issues arose out of population aging [1] and experts hoped to monitor people’s health through various physiological sensors [2]. Electrocardiogram (ECG) is one of the physiological signals [3]. Since the milestone paper proposed in 1996, the study of ECG is still an ongoing hot research topic [4–7]. Some software (S/W) application for ECG analysis had been developed on personal computer (PC) [8]. Figure 1 shows a standard routine of ECG signal processing. The detection of heartbeats (QRS complexes) is the first step, while R is the peak of the complex and heart rate variability (HRV) is the standard deviation of time sequence (RR-intervals). The time domain analysis reports the activity of circulatory system and the frequency domain analysis reflects the sympathovagal balance of autonomic nervous system (ANS) [9–13]. In our previous works, this standard routine had been modified to MATLAB codes [14, 15] and the QRS detection algorithm had also been implemented in field programmable gate array (FPGA) [16]. Figure 1: The block diagram of the overall signal processing flow of ECG analysis. Beyond PC, mobile phone is another S/W solution [17, 18]. In the other way, the QRS detection algorithm can be found in hardware (H/W) implementations, such as ARM [19], DSP [20, 21], FPGA [22–24], or ASP [25]. For the purpose of long time use, an application-specific integrated circuit (ASIC) solution of real-time and very low-power consumption should be considered. Some previous chip designs were surveyed as the comparison targets [26–38]. We will give a detailed description for our design, which had been presented briefly in 2010 [39], in this paper. For the application, one [27] of above ECG chips had been embedded into a biomedical system already [40]. The remainder of this paper is structured as follows. In Section 2, the algorithm design is briefly described. In Section 3, we state the architecture design. In Section 4,
Current Research on Transgenic Plants for Conferring Virus Tolerance
植物抗病毒基因工程的某些现状

Hou Bing-kai,Yu Hui-min,
侯丙凯
,于惠敏

植物学报 , 1995,
Abstract:
生物钟的分子机制研究进展 Recent Developments in Molecular Mechanisms of Biological Clock
侯丙凯,于惠敏HOU Bing-Kai,YU Hui-Min
遗传 , 1996,
Abstract: RecentDevelopmentsinMolecularMechanismsofBiologicalClockHouBingkai(DepartmentofBiology,ShandongUniversity,Jinan250100)YuHuimin(DepartmentofBiochemistry,ShandongEducationCollege,Jinan250013)生物的昼夜节奏表现,从单细胞生物到多细胞生物,从原校生物到真核生物都曾被描述过。由于这种现象在生物界广泛存在,关于它的特征、意义和机理的研究日益受到人们重视。其中最重要和最吸引人的方面是它的测时系统—一生物钟(biologicalclock),也称生物振荡器(oscillators)。近年来,人们从分子水平对生物钟的研究比较活…
Research on Compressive Sensing Based 3D Imaging Method Applied to Ground Penetrating Radar
压缩感知理论在探地雷达三维成像中的应用

Yu Hui-min Fang Guang-you,
余慧敏
,方广有

电子与信息学报 , 2010,
Abstract: Considering the sparse structure of actual target space in GPR application, a novel 3D imaging method based on random aperture compressive sensing is proposed in this paper, which capable of reconstructing the target space from a few compressive sensing data obtained by random aperture measurements, and the imaging performance versus noise level and the effects of different measurement matrices are analyzed. The computer simulation results indicate that the proposed algorithm allow much fewer data, much shorter measurement time. And due to it is fully utilization of the sparse structure of interested target space, the method show much more robust and sparse image than time-domain standard back-projection method.
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