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Magnetization of Nano-Size Subsystem in a Two-Dimensional Ising Square Lattice  [PDF]
Liang-Ming He, Rong Wang, Cai-Liu Yin, San-Jun Peng, Dong Qian
World Journal of Condensed Matter Physics (WJCMP) , 2012, DOI: 10.4236/wjcmp.2012.24029
Abstract: A two-dimensional Ising square lattice is modeled as a nano-size block array to study by Monte Carlo simulation the magnetic thermal stability of nano-structure magnetic media for data storage, thereon in the blocks J1 > 0 is assigned for the interaction of a pair of nearest-neighbor spins, while 0 J0 J1 for that in regions between the blocks and (J0 + J1)/2 for the nearest-neighbor pairs with one in the block and the other one out of but near-most the block. We show that the magnetic thermal stability of the block accrues with the increase of J1 and with the decrease of J1 - J0 for a given J1, but contrarily, the anchoring ability for the initial magnetic orientation in nano-size block trails off as J1 - J0 diminish. This phenomena and size dependence of such anchoring ability are discussed in detail.
State vector evolution localized over the edges of a square tight-binding lattice

He Liang-Ming,Shi Duan-Wen,

中国物理 B , 2009,
Abstract: We study the time evolution of a state vector in a square tight-binding lattice, focusing on its evolution localized over the system surfaces. In this tight-binding lattice, the energy of atomic orbital centred at surface site is different from that at the interior (bulky) site by an energy shift U. It is shown that for the state vector initially localized on a surface, there exists an exponential law (y=a\ex/b+y0) determined by the absolute value of the energy shift, |U|, which describes the transition of the state evolving on the square tight-binding lattice, from delocalized over the whole lattice to localized over the surfaces.
Self-healing group key distribution scheme based on enhanced dual directional hash chains
基于增强型双向散列链的自愈组密钥分发方案

QIN Rong-hu,HE Liang-ming,YANG Xu,YUAN Xiao-bing,
覃荣华
,何亮明,杨 旭,袁晓兵

计算机应用研究 , 2012,
Abstract: The conventional dual directional hash chains based self-healing group key distribution schemes are vulnerable to the collusion attack. To overcome the problem, this paper introduced EDDHC, which consisted of a slide window and a light weight sub-chain LiBHC. The paper also used EDDHC to design the group key distribution scheme. The proposed scheme enabled the seamless switching of the group key in used and the greater reduction of security vulnerability to the collusion attack. The analysis illustrates that the scheme maintains low resource overhead while achieving better reliability and security performance.
Key Distribution Scheme in Designated Manually Deployed Wireless Sensor Networks Based on One-way Hash Chain
基于单向散列链的定点布设无线传感器网络密钥分配方案

QIN Rong-hua,HE Liang-ming,LI Bao-qing,YUAN Xiao-bing,
覃荣华
,何亮明,李宝清,袁晓兵

计算机科学 , 2013,
Abstract: Aiming at the case of manually deployed wireless sensor networks(WSNs) , we introduced a key distribution scheme based on one-way hash chain. By employing the mechanism of key chain partly activation,our scheme can effectively weaken the threat of node capture, be resilience against node replication or node forgery. Besides of good security properties, the scheme supports node redeployment and promises good network coverage rate.
Postpartum Unilateral Horner's Syndrome Following Lumbar Epidural Anesthesia after a Cesarean Delivery.
Shu-Yam Wong,Ching-Feng Lin,Liang-Ming Lo,Tsui-Chin Peng
Chang Gung Medical Journal , 2004,
Abstract: We report on a case demonstrating unilateral Horner's syndrome (HS) after lumbarepidural obstetric anesthesia. A healthy, 32-year-old woman with a breech presentation wasscheduled for an elective Cesarean section. The patient had normal vital signs throughoutthe surgical procedure. The operation lasted for 50 min. In the recovery room, she complainedof left nasal stuffiness, left cheek numbness, and heaviness in her left eye.Meanwhile, left nipple sensory loss was noted during baby suckling training. On physicalexamination, her left eyelid was droopy along with left-side ptosis and facial flushing.Reduced sensation over the left hemifacial region and upper arm was also noted, whichresolved completely over the next 110 min. A diagnosis of unilateral HS was then made.Although typically a benign side effect which often spontaneously resolves, HS is likely tocause anxiety in both the patient and the doctor. Prompt recognition of this syndrome anddetermination of its cause from lumbar epidural anesthesia can prevent unnecessary andpotentially dangerous diagnostic workup and can reassure both patients and clinicians. Thepatient was discharged from the hospital 5 days after onset with a good outcome.
Timing of Initiating Epidural Analgesia and Mode of Delivery in Nulliparas: A Retrospective Experience Using Ropivacaine
Hui-Ling Lee,Liang-Ming Lo,Chung-Chuan Chou,Tzu-Yi Chiang
Chang Gung Medical Journal , 2008,
Abstract: Background: The timing of initiation of epidural analgesia and its causal relationship withmode of delivery is controversial. This retrospective investigation reviewsand determines whether early initiation of epidural analgesia in nulliparouswomen influences the rate of cesarean sections as well as other obstetric outcomemeasures.Methods: The nursing records of 1623 parturients who received epidural analgesiawere retrospectively reviewed. Of these, 704 nulliparous parturients whopresented in spontaneous labor or had spontaneous rupture of the membranesand received epidural analgesia with a regimen of ropivacaine and fentanylwere included in this study. All parturients received the epidural protocol followingtheir first request. Parturients were divided into early (n = 457) andlate (n = 247) groups according to cervical dilatation < 3 cm and ≧ 3 cm,respectively, when epidural analgesia was initiated. The mean primarycesarean section rate during the research period was calculated from themonthly report of the department of obstetrics and gynecology.Results: The mean primary cesarean section rate in the institution was 23.6% duringthe research period. The overall cesarean section rate was 13.4% (n = 704) inthe studied groups. The early group required more top-up epidural anestheticboluses, and had a higher cesarean section rate than the late group (16.4% vs.7.7%, p = 0.002). However, the cesarean section rates of both groups werelower than the mean primary cesarean section rate. No difference wasobserved between groups in the percentage of arrested labor as the primaryindication for cesarean section. Early epidural analgesia shortened the durationof the active phase of the first stage of vaginal delivery. No differencewas observed between groups in the duration of the second stage or theinstrumental vaginal delivery rate.Conclusions: The administration of epidural analgesia with a regimen of ropivacaine andfentanyl should not be delayed until cervical dilatation reaches 3 cm in nulliparaswho are in spontaneous labor or have spontaneous rupture of the membranes.The timing of epidural analgesia should be determined on an individualizedbasis.
Comparison between 0.08% Ropivacaine and 0.06% Levobupivacaine for Epidural Analgesia during Nulliparous Labor: A Retrospective Study in A Single Center
Hui-Ling Lee,Liang-Ming Lo,Chung-Chuan Chou,Eng-Chye Chuah
Chang Gung Medical Journal , 2011,
Abstract: Background: Levobupivacaine and ropivacaine are new local anesthetics that have effectssimilar to bupivacaine. However, the relative potency of these two drugs iscontroversial. The purpose of this retrospective study was to assess whether acombination of 0.06% levobupivacaine and 0.0002% fentanyl had the sameeffects as 0.08% ropivacaine and 0.0002% fentanyl on the mode of deliveryand other obstetric outcomes when used for epidural analgesia of labor innulliparous women.Methods: Computer records of 392 Asian nulliparous parturients, who had presentedwith spontaneous labor or spontaneous rupture of the membranes, and hadreceived epidural analgesia were retrospectively reviewed. Of these, 193received 0.08% ropivacaine and 199 received 0.06% levobupivacaine.Fentanyl (0.0002%) was used in both regimens.Results: There were no significant differences in the mode of delivery, duration oflabor, or neonatal outcome between the two groups. In the levobupivacainegroup, the parturients required top-up boluses of local anesthetics more frequently (1.4 1.6 vs. 0.9 1.3, p < 0.0001), and the incidence of temporary maternal fever (25% vs. 15%, p = 0.024) and the cost of local anestheticwere higher (292 183 NTD vs. 146 104 NTD, p < 0.0001). However,the amount of local anesthetic administered during labor was lower (79 49mg vs. 114 81 mg, p < 0.0001) than for the ropivacaine group.Conclusions: 0.06% levobupivacaine was as effective as 0.08% ropivacaine, when bothwere used with 0.0002% fentanyl for labor epidural analgesia of nulliparouswomen.
Preliminary Normal Reference Values of Nuchal Translucency Thickness in Taiwanese Fetuses at 11-14 Weeks of Gestation
Jenn-Jeih Hsu,Ching-Chang Hsieh,Chi-Hsin Chiang,Liang-Ming Lo
Chang Gung Medical Journal , 2003,
Abstract: Background: To investigate normal reference values of nuchal translucency (NT) thicknessin normal Taiwanese fetuses between 11 and 14 weeks of gestation.Methods: A prospective study of ultrasound measurements of fetal NT and crownrumplength (CRL) at 11-14 weeks of gestation was conducted in 724 consecutiveTaiwanese fetuses between 1998 and 2001. The relationshipbetween NT and 5-mm intervals of the CRL of the fetus was analyzed. NTthickness was converted into multiple of median (MoM) values for the properCRL. The estimated risk of trisomy 21 was calculated in combination withmaternal age and NT MoM.Results: NT thickness increased with increasing CRL and gestational week in the firsttrimester. The mean (median) of NT thickness at 11-14 weeks was 1.56(1.50) mm. Values of NT logMoM showed a normal Gaussian distributionwith a mean of -0.0062 and standard deviation of 0.1146. The overall frequencyof NT thickness of > 2.5 mm and > 3.0 mm was 1.7% (12/724) and0.7% (5/724), respectively. There were 18 (2.5%) of 724 normal fetuses withthe eseimated risk of trisomy 21, based on maternal age and NT thicknesshigher than 1:300.Conclusions: Because of weekly variations and racial differences in NT measurements,normal reference values should be established to convert NT thickness intoMoM values for calculating the estimated risk of trisomy 21 in first-trimesterNT screening.
Diagnostic study on the electron density distribution of microwave plasma jet in local vacuum environment
局域环境中微波等离子体电子密度诊断实验研究

Yang Juan,Xu Ying-Qiao,Zhu Liang-Ming,
杨涓
,许映乔,朱良明

物理学报 , 2008,
Abstract: In order to diagnose the electron density of microwave plasma jet confined by solid boundary walls, the emission/Langmuir probe was applied to measure the plasma space potential and current and voltage property when the probe is charged by heating and scanning power supply separately. According to the plasma space potential, saturated current on the current-voltage characteristics of plasma can be distinguished, which can be used to estimate the number density of electrons in the plasma. The results show that the magnitude of electron density ranges from 8.8×1014 to 7.53×1016/m3, the electron density on the centerline of jet decreases linearly off the nozzle exit plane, but it has approximately parabolic distribution along the plasma jet direction when leaving the centerline. Increasing mass flow rate at constant power and increasing power at constant mass flow rate will increase electron density.
Calculation and ahanging of roughness of sea surface in Pacific Ocean in ENSO period
太平洋海面粗糙度的计算及在ENSO期间的变化

GUO Jie,GUO Pei-fang,ZHOU Liang-ming,
过 杰
,郭佩芳,周良明

海洋科学 , 2006,
Abstract: We calculated values of roughness in 15 points using wind speed by TOPEX satellite Altimeter.We studied the changes of roughness during 1997~1999(ENSO period) and compared them with roughness in 1996.We find some characteristics as follows: The largest roughness nearby equator is moving from station A to station C to station B and the smallest roughness is moving from station B to station A during the EI Nion period.The smallest roughness is in station A and the largest roughness is in station B during LI Nina period.The roughness of 15 stations in 1999 is bigger than those in 1996,1997,1998.The roughness of 4 seasons has prominent change during ENSO period when compared with 1996.
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