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Search Results: 1 - 10 of 134944 matches for " ZHANG Cheng-Xiang "
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Stress responses of Canna indica to Cd and its accumulation of Cd
美人蕉对镉的胁迫反应及积累特性

ZHANG Cheng-Xiang,CHEN Wei-Feng,
张呈祥
,陈为峰

植物生态学报 , 2012,
Abstract: Aims The valuable ornamental plant Canna indica is widely distributed in city gardens and on roadsides in China. Our objective was to study the stress responses of C. indica to cadmium (Cd) and its accumulation of Cd. Methods With pot culture experiments, C. indica was cultured with different Cd concentrations. Morphological, ecological, physiological indexes were observed during the growth of C. indica. The distribution of Cd in C. indica plants was determined after harvest. Important findings The Cd treatment of <1 mg·kg–1 had no obvious effect on growth of C. indica; however, Cd concentration of >5 mg·kg–1 inhibited growth. The flowering period was prolonged with <5 mg·kg–1 Cd concentration. With increasing Cd concentration, root activity, chlorophyll and water content all decreased, soluble sugar content initially increased and then decreased, and free proline content and permeability of cell membrane increased gradually. The distribution of Cd in C. indica was root > shoot. With increasing Cd concentration of the medium, Cd concentration in shoots and roots increased; however, the accumulator and translocation factors decreased gradually. The maximum accumulation of Cd in C. indica was 5.89 mg·plant–1 with the treatment of 20 mg·kg–1 . It is concluded that C. indica is suitable for landscaping use when the Cd concentration in soil is <1 mg·kg–1 .
Perceptual Pitch Deficits Coexist with Pitch Production Difficulties in Music but Not Mandarin Speech
Wu-xia Yang,Jie Feng,Wan-ting Huang,Cheng-xiang Zhang,Yun Nan
Frontiers in Psychology , 2013, DOI: 10.3389/fpsyg.2013.01024
Abstract: Congenital amusia is a musical disorder that mainly affects pitch perception. Among Mandarin speakers, some amusics also have difficulties in processing lexical tones (tone agnosics). To examine to what extent these perceptual deficits may be related to pitch production impairments in music and Mandarin speech, 8 amusics, 8 tone agnosics, and 12 age- and IQ-matched normal native Mandarin speakers were asked to imitate music note sequences and Mandarin words of comparable lengths. The results indicated that both the amusics and tone agnosics underperformed the controls on musical pitch production. However, tone agnosics performed no worse than the amusics, suggesting that lexical tone perception deficits may not aggravate musical pitch production difficulties. Moreover, these three groups were all able to imitate lexical tones with perfect intelligibility. Taken together, the current study shows that perceptual musical pitch and lexical tone deficits might coexist with musical pitch production difficulties. But at the same time these perceptual pitch deficits might not affect lexical tone production or the intelligibility of the speech words that were produced. The perception-production relationship for pitch among individuals with perceptual pitch deficits may be, therefore, domain-dependent.
5G green cellular networks considering power allocation schemes
Xiaohu Ge,Jiaqi Chen,Cheng-xiang Wang,John Thompson,Jing Zhang
Computer Science , 2015,
Abstract: It is important to assess the effect of transmit power allocation schemes on the energy consumption on random cellular networks. The energy efficiency of 5G green cellular networks with average and water-filling power allocation schemes is studied in this paper. Based on the proposed interference and achievable rate model, an energy efficiency model is proposed for MIMO random cellular networks. Furthermore, the energy efficiency with average and water-filling power allocation schemes are presented, respectively. Numerical results indicate that the maximum limits of energy efficiency are always there for MIMO random cellular networks with different intensity ratios of mobile stations (MSs) to base stations (BSs) and channel conditions. Compared with the average power allocation scheme, the water-filling scheme is shown to improve the energy efficiency of MIMO random cellular networks when channel state information (CSI) is attainable for both transmitters and receivers.
Treatment of malignant tumor with Shenqi Fuzheng Injection combined with chemotherapy: A report of 48 cases
SUN Cheng-Xiang
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract:
Evidence-based appraisal in laparoscopic Nissen and Toupet fundoplications for gastroesophageal reflux disease
Cheng-Xiang Shan, Wei Zhang, Xiang-Min Zheng, Dao-Zhen Jiang, Sheng Liu, Ming Qiu
World Journal of Gastroenterology , 2010,
Abstract: AIM: To demonstrate the optimal surgical procedure for gastroesophageal reflux disease.METHODS: The electronic databases of Medline, Elsevier, Springerlink and Embase over the last 16 years were searched. All clinical trials involved in the outcomes of laparoscopic Nissen fundoplication (LNF) and laparoscopic Toupet fundoplication (LTF) were identified. The data of assessment in benefits and adverse results of LNF and LTF were extracted and compared using meta-analysis.RESULTS: We ultimately identified a total of 32 references reporting nine randomized controlled trials, eight prospective cohort trials and 15 retrospective trials. These studies reported a total of 6236 patients, of whom 4252 (68.18%) underwent LNF and 1984 (31.82%) underwent LTF. There were no differences between LNF and LTF in patients’ satisfaction, perioperative complications, postoperative heartburn, reflux recurrence and re-operation. Both LNF and LTF enhanced the function of lower esophageal sphincter and improved esophagitis. The postoperative dysphagia, gas-bloating syndrome, inability to belch and the need for dilatation after LNF were more common than after LTF. Subgroup analyses showed that dysphagia after LNF and LTF was similar in patients with normal esophageal peristalsis (EP), but occurred more frequently in patients with weak EP after LNF than after LTF. Furthermore, patients with normal EP after LNF still had a higher risk of developing dysphagia than did patients with abnormal EP after LTF.CONCLUSION: Compared with LNF, LTF offers equivalent symptom relief and reduces adverse results.
Spectrum and Energy Efficiency Evaluation of Two-Tier Femtocell networks With Partially Open Channels
Xiaohu Ge,Tao Han,Yan Zhang,Guoqiang Mao,Cheng-Xiang. Wang,Jing Zhang,Bin Yang,Sheng Pan
Computer Science , 2014, DOI: 10.1109/TVT.2013.2292084
Abstract: Two-tier femtocell networks is an efficient communication architecture that significantly improves throughput in indoor environments with low power consumption. Traditionally, a femtocell network is usually configured to be either completely open or completely closed in that its channels are either made available to all users or used by its own users only. This may limit network flexibility and performance. It is desirable for owners of femtocell base stations if a femtocell can partially open its channels for external users access. In such scenarios, spectrum and energy efficiency becomes a critical issue in the design of femtocell network protocols and structure. In this paper, we conduct performance analysis for two-tier femtocell networks with partially open channels. In particular, we build a Markov chain to model the channel access in the femtocell network and then derive the performance metrics in terms of the blocking probabilities. Based on stationary state probabilities derived by Markov chain models, spectrum and energy efficiency are modeled and analyzed under different scenarios characterized by critical parameters, including number of femtocells in a macrocell, average number of users, and number of open channels in a femtocell. Numerical and Monte-Carlo (MC) simulation results indicate that the number of open channels in a femtocell has an adverse impact on the spectrum and energy efficiency of two-tier femtocell networks. Results in this paper provide guidelines for trading off spectrum and energy efficiency of two-tier femtocell networks by configuring different numbers of open channels in a femtocell.
The Minimally Invasive Effect of Breast Approach Endoscopic Thyroidectomy: An Expert's Experience
Wei Zhang,Zhi-guo Jiang,Dao-zhen Jiang,Xiang-min Zheng,Hong-liang Shen,Cheng-xiang Shan,Sheng Liu,Ming Qiu
Clinical and Developmental Immunology , 2010, DOI: 10.1155/2010/459143
Abstract: We evaluated the invasiveness of breast approach endoscopic thyroidectomy (BAET) carried out by surgeon very experienced in this procedure. Twenty-four patients who underwent BAET and 19 patients who underwent conventional thyroidectomy were the study population. Postoperative pain was assessed by a visual analog scale (VAS). The values 2, 12, and 24 h after surgery were significantly lower in the BAET group than those in the conventional group. Serum IL-6 and CRP levels were measured by an ELISA preoperatively and at 2, 12, 24 and 48 h after operation. Their values increased significantly after both procedures when compared to preoperative levels with significant differences between the two groups detected at the 24-hour and 48-hour time points. Subjective and objective evidence supported the notion that BAET could become a minimally invasive procedure if the surgeon gained sufficient experience.
One-step Preparation Process of Magnesium Hydroxide Flame Retardant from Magnesium Sulfate
硫酸镁一步法制备氢氧化镁阻燃剂

HU Zhang-wen,WANG Li-xiang,YANG Bao-jun,SHAN Cheng-xiang,
胡章文
,王理想,杨保俊,单承湘

过程工程学报 , 2007,
Abstract: 实验确定了由硫酸镁一步法制备阻燃型氢氧化镁较适宜的条件为:表面处理剂添加量5~10mL(以制备5g氢氧化镁为基准),恒温处理时间3~4 h,陈化时间4~6 h.此工艺条件下,所制得的氢氧化镁样品XRD分析表明,(001)面对应的衍射峰强度明显高于(101)面,样品(101),方位的扭歪值η<3.0×10-3,比表面积SDET<20m2/g,颗粒形貌为棒状,直径为25~50nm,长径比为8~10,且分散性好,样品符合阻燃型氢氧化镁的特殊要求.该工艺具有流程短、设备简单、操作条件温和(常压、低温操作)、成本低等特点.
Progress in laparoscopic anatomy research: A review of the Chinese literature
Li-Jie Li, Xiang-Min Zheng, Dao-Zhen Jiang, Wei Zhang, Hong-Liang Shen, Cheng-Xiang Shan, Sheng Liu, Ming Qiu
World Journal of Gastroenterology , 2010,
Abstract: The development of laparoscopic surgery has generated the new field of study, laparoscopic anatomy. This article reviews the reported literature on laparoscopic anatomy and explores how it has evolved along with advances in abdominal surgery. In addition, the principal concerns in current laparoscopic anatomy research are discussed, including: (1) types of special adjacent anatomical structures; and (2) special surgical planes and anatomical landmarks. Understanding of systematic laparoscopic anatomy can provide the junior surgeons a clear procedural approach, and would benefit laparoscopic surgeons in training.
The Minimally Invasive Effect of Breast Approach Endoscopic Thyroidectomy: An Expert's Experience
Wei Zhang,Zhi-guo Jiang,Dao-zhen Jiang,Xiang-min Zheng,Hong-liang Shen,Cheng-xiang Shan,Sheng Liu,Ming Qiu
Journal of Immunology Research , 2010, DOI: 10.1155/2010/459143
Abstract: We evaluated the invasiveness of breast approach endoscopic thyroidectomy (BAET) carried out by surgeon very experienced in this procedure. Twenty-four patients who underwent BAET and 19 patients who underwent conventional thyroidectomy were the study population. Postoperative pain was assessed by a visual analog scale (VAS). The values 2, 12, and 24?h after surgery were significantly lower in the BAET group than those in the conventional group. Serum IL-6 and CRP levels were measured by an ELISA preoperatively and at 2, 12, 24 and 48?h after operation. Their values increased significantly after both procedures when compared to preoperative levels with significant differences between the two groups detected at the 24-hour and 48-hour time points. Subjective and objective evidence supported the notion that BAET could become a minimally invasive procedure if the surgeon gained sufficient experience. 1. Introduction Pursuit of an esthetically pleasing scar after open thyroidectomy has led surgeons to carry out endoscopic thyroid surgery [1]. Hüscher et al. [2] described the first case in 1997. Ikeda et al. [3] and Ohgami et al. [4] further improved the cosmetic result by carrying out endoscopic thyroidectomy via an axillary and anterior breast approach in 2000. This scarless (in the neck) endoscopic thyroidectomy (SET) attracted widespread attention due to the very good cosmetic effect achieved. The disadvantage of SET is a much larger plane of tissue dissection [1, 5]. Some surgeons think that SET should be classified as “minimal access but maximally invasive” surgery [1]. SET is usually related to longer operation time and more postoperative pain [1, 5], but some surgeons believe that these factors could reduced with the accumulation of experience [1, 6]. The learning curve of SET is very long, and a surgeon has to carry out about 150 SETs before reaching an advanced level in terms of the skill, proficiency, and stability of the operation [7]. Until August 2006, 230 cases of SET (all were breast approach endoscopic thyroidectomy (BAET)) have been carried out in our center. We believe that evaluating the invasiveness of this innovative surgical procedure at this stage is rational. Current evaluation of surgical invasiveness related to SET relies solely on assessment of postoperative pain, so subjective bias cannot be avoided [8, 9]. Surgery is a unique example of “planned trauma” not only leading to pain, but also evoking a metabolic and inflammatory response (acute-phase response) characterized by release of various proinflammatory cytokines and
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