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Search Results: 1 - 10 of 206038 matches for " YUAN DE-RONG "
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物理学报 , 2001,
Abstract: Gordon首先采用带有非对称双阱势的氢键链模型研究了氢键铁电体的电导性,给出了扭结解和迁移率的表达式.但是对于电导有贡献的扭结孤子应该对应于质子在两个阱底之间的转移,基于这种考虑,修正了Gordon的结果,重新导出了低能态的扭结解,给出了迁移率的一个新的表达式.当非对称双阱势转化为对称双阱势时,这个表达式恰与以前的研究结果一致.这个表达式表明,相变临界指数是1.


物理学报 , 2001,
Abstract: 阻尼和外电场的作用使得带有非对称双阱势的氢键链存在扭结孤子激发.计算了孤子的迁移率,它包含了φ4链的结果
No Survival Benefit from Adding Cetuximab or Panitumumab to Oxaliplatin-Based Chemotherapy in the First-Line Treatment of Metastatic Colorectal Cancer in KRAS Wild Type Patients: A Meta-Analysis
Si-wei Zhou, Yuan-yuan Huang, Ying Wei, Zhi-min Jiang, Yuan-dong Zhang, Qiong Yang, De-rong Xie
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050925
Abstract: Background The efficacy of combined therapies of oxaliplatin-based chemotherapy and anti-epidermal growth factor receptor (anti-EGFR) monoclonal antibodies (MAbs) remains controversial in colorectal cancer (CRC). The aim of this study is to estimate the efficacy and safety of adding cetuximab or panitumumab to oxaliplatin-based chemotherapy in the first line treatment in KRAS wild type patients with metastatic colorectal cancer (mCRC) through meta-analysis. Methods Medline, EMBASE, and Cochrane library, American Society of Clinical Oncology (ASCO) and European Society for Medical Oncology (ESMO) were searched. Eligible studies were randomized controlled trials (RCTs) which evaluated oxaliplatin-based chemotherapy with or without anti-EGFR drugs (cetuximab or panitumumab) in untreated KRAS wild type patients with mCRC. The outcomes included overall survival (OS), progression-free survival (PFS), overall response rate (ORR) and toxicities. Hazard ratios (HR) and risk ratio (RR) were used for the meta-analysis and were expressed with 95% confidence intervals. Results This meta-analysis included four RCTs with 1270 patients, and all of the patients were administered oxaliplatin-based chemotherapy regimens with or without anti-EGFR MAbs. The result of heterogeneity of OS was not significant. Compared with chemotherapy alone, the addition of cetuximab or panitumumab didn’t result in significant improvement in OS (HR = 1.00, 95%CI [0.88, 1.13], P = 0.95) or PFS (HR = 0.86, 95%CI [0.71, 1.04], P = 0.13). The subgroup analysis of cetuximab also revealed no significant benefit in OS (HR = 1.02, 95%CI [0.89, 1.18], P = 0.75) or in PFS (HR = 0.87, 95%CI [0.65, 1.17], P = 0.36). Patients who received combined therapy didn’t have a higher ORR (Risk Ratio = 1.08, 95%CI [0.86, 1.36]). Toxicities slightly increased in anti-EGFR drugs group. Conclusions The addition of cetuximab or panitumumab to oxaliplatin-based chemotherapy in first-line treatment of mCRC in wild type KRAS population did not improve efficacy in survival benefit and response rate. More RCTs are warranted to evaluate the combination of chemotherapy and targeted therapy.
Postoperative Chemoradiotherapy versus Postoperative Chemotherapy for Completely Resected Gastric Cancer with D2 Lymphadenectomy: A Meta-Analysis
Yuan-Yuan Huang, Qiong Yang, Si-Wei Zhou, Ying Wei, Yan-Xian Chen, De-Rong Xie, Bei Zhang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0068939
Abstract: Background Both chemoradiotherapy and chemotherapy are used in postoperative adjuvant therapy for resected gastric cancer. However, it is controversial whether chemoradiotherapy or chemotherapy is the optimal strategy for patients with gastric cancer after D2 lymphadenectomy. The present meta-analysis aims to provide more evidence on the relative benefits of adjuvant therapies in this setting. Methods We conducted a systematic review of randomized controlled trials, extracted time-to-event data using Tierney methods (when not reported), and performed meta-analysis to obtain the relative hazards of adjuvant chemoradiotherapy to chemotherapy on efficacy and toxicities. Results A total of 895 patients from 3 randomized controlled trials were identified for this meta-analysis. All patients were from Asian countries. Our results showed that postoperative chemoradiotherapy significantly improved locoregional recurrence-free survival [LRRFS: hazard ratio (HR) = 0.53, 95% CI = 0.32–0.87, p = 0.01] and disease-free survival (DFS: HR = 0.72, 95% CI = 0.59–0.89, p = 0.002); however, the improvement of distant metastasis recurrence-free survival (DMRFS: HR = 0.86; 95% CI = 0.66–1.11, p = 0.25) and overall survival (OS: HR = 0.79, 95% CI = 0.61–1.03, p = 0.08) were non-significant. The main grade 3 or 4 toxicities were equivalent between the two groups. Conclusion In non-selected Asian patients with resected gastric cancer who underwent D2 lymphadenectomy, postoperative chemoradiotherapy improved LRRFS and DFS but might not improve OS compared to postoperative chemotherapy.
Efficacy and adverse effects of transdermal fentanyl and sustained-release oral morphine in treating moderate-severe cancer pain in Chinese population: a systematic review and meta-analysis
Qiong Yang, De-Rong Xie, Zhi-Min Jiang, Wen Ma, Yuan-Dong Zhang, Zhuo-Fei Bi, Deng-Lin Chen
Journal of Experimental & Clinical Cancer Research , 2010, DOI: 10.1186/1756-9966-29-67
Abstract: Updated cohort studies on transdermal fentanyl and oral morphine in the treatment of cancer pain were searched in electronic databases including CBMdisc, CNKI, VIP, Medline, EMBASE and Cochrane Library. Primary end points assessed by meta-analysis were remission rate of pain and incidence of adverse effects. Quality of life was assessed by systematic review, which was the second end point.32 cohort studies, which included 2651 patients, were included in present study. The remission rate in transdermal fentanyl group and sustained-release oral morphine group were 86.60% and 88.31% respectively, there was no significant difference [RR = 1.13, 95% CI (0.92, 1.38), P = 0.23]. Compared with oral morphine group, there were less adverse effects in terms of constipation [RR = 0.35, 95% CI (0.27, 0.45), P < 0.00001], nausea/vomiting [RR = 0.57, 95% CI (0.49, 0.67), P < 0.00001], and vertigo/somnolence [RR = 0.59, 95% CI (0.51, 0.68), P < 0.00001] in transdermal fentanyl group. Six of selected trials supported either transdermal fentanyl or sustained-release oral morphine improved QOL of cancer patients and one of them showed more patients got better QOL after sustained-release oral morphine transferred to transdermal fentanyl.Our study showed again that both transdermal fentanyl and oral morphine had the same efficacy in the treatment of moderate-severe cancer pain in Chinese population, but the former might have less adverse effects and better quality of life.For patients with cancer, up to 70% suffered from pain caused by their disease or its treatment [1]. For patients with advanced cancer, pain was described as moderate-severe in approximately 40%-50% and as very severe in 25%-30% [2]. Because pain was an important symptom and occurred frequently in cancer patients, especially for moderate-severe cancer pain, relief of pain should therefore be seen as part of a comprehensive pattern of cancer care.Since the 1980s, treatment of cancer pain was based on the WHO analgesic l
Chaos suppression in the coupled dynamo-system by adjusting the L-two-gain

TAN Fu-xiao,GUAN Xin-ping,LIU De-rong,LUO Xiao-yuan,

控制理论与应用 , 2008,
Abstract: Under certain conditions, chaos may occur in a coupled dynamo-system, which can cause the system to be out of control or completely to breakdown. To deal with the uncertain disturbances in the system, we put forward the Ltwo-gain control scheme to asymptotically stabilize the chaotic system and restrain the disturbance. The passivity method is then applied to design the feedback stability controller, and the L-two-gain is adjusted to restrain the disturbance. The simulation results demonstrate the validity of the method.
Landscape diversity of Napahai wetland plant community in Northwest Yunnan of China

XIAO De-rong,TIAN Kun,YUAN Hua,LI Ning-yun,XU Shou-guo,

生态学杂志 , 2007,
Abstract: The Napahai wetland in Northwest Yunnan is a typical degraded plateau wetland. By the temporal-spatial substitution method and 3S technology, and combining with filed survey, the landscape diversity of the plant community in Napahai wetland was studied, with the driving forces investigated. The results showed that under human disturbance, the succession from primary swamp and swampy meadow to meadow and reclaimed wetland plant community accelerated, wetland environment kept losing, and its function declined gradually. The spatial variation pattern of the landscape diversity of plant community at different succession stage was the response to the change of wetland environment, which reflected the current status of the aquatic environment and function of the wetland, as well as the type and intensity of human disturbance.
The distribution patterns and changes of aquatic plant communities in Napahai Wetland in northwestern Yunnan Plateau, China

XIAO De-Rong,TIAN Kun,YUAN Hu,YANG Yu-Ming,LI Ning-Yun,XU Shou-Guo,

生态学报 , 2006,
Abstract: Using 3S technology and plant community research methodology,a study on the distribution patterns of and changes to the aquatic plant communities in the high plateau Napahai wetland over the past 24a produced the following results: compared with the aquatic plant communities 24a before,the types and numbers of aquatic plant communities changed,and pollution-tolerant,nutrient-loving plant communities such as Com.Scirpus tabernaemontani,Com.Zizania caduciflora, Com.Myriophyllum spicatum,and Com.Azolla imbricata flourished while primary aquatic plant communities shrank or disappeared.Over the past 24a,the number of aquatic communities has increased from 9 to 12,with two new emergent plant communities and one new floating-leaved plant community.The increase in emergent plant communities was most marked.From east to west and from south to north,there was a pattern of successively distributed floating-leaved plant communities, emergent plant communities and submerged plant communities.With the succession of communities from submerged plant communities to floating-leaved plant communities,and floating-leaved plant communities to emergent plant communities,the composition of communities became complicated,and the number of accompanying species increased while the occurrence of dominant plant species decreased.The current distribution area of emergent plant communities,528.42hm~2,is the largest; submerged plant communities cover 362.50hm~2;and the distribution area of floating-leaf plant communities is the smallest,covering 70.23hm~2.The distribution pattern and change in Napahai wetland's aquatic plant communities is a reaction to the change in the wetland environment.This research showed that human disturbances have led to an inward movement of the wetland shoreline,a decrease in water quality and a reduction in wetland habitat.

FU De-rong,

地球学报 , 1987,
Abstract: According to length of extension, cutting depth, intensity of activity, sequence of formation and different roles in controlling the basins, the faults may be divided into basement faults and syndepositional ones.Basement faults refer to those that control the formation and distribution of the basins, and often make up boundaries of these basins or of the se-condorder structure units within them. They are characterized by early occurrence, prolonged activity, long extension, large throw and, consequently, greater cutting depth.Syndepositional faults refer to some faults in the basin which occurred somewhat later than the basement faults. They are of smaller extension and cutting depth; their downward extension usually fails of reach the basement of the basin, and gradually disappears in the sedimentary cover. It is obvious that they have controlled such sedimentation as lithofacies and variation of thickness in the basin.These two types of faults not only were extensively distributed but also occurred in great quantities in the process of the formation and evolution of the Mesozoic-Ceuozoic basins in east China. As for the characteristics of their forms, the fault surfaces are generally curved upward, and become gentle in dip with depth, possessing the features of normal fault. Therefore, they are called listric faults.Some ideas are put forward in this paper as to the formation mechanism this sort of listric faults as well as their association with the extension of the basins: 1. The formation of the listric basement faults is closely related to the "thermal events". The transmission of thermal energy from the asthenosphe-re to the earth's crust softens the lower part of the crust and makes it ductile, with the ductility dependent on the temperature. As the temperature rises with the depth, it is reasonably presumed that the ductility will increase to some extent at the greater depths of the crust. A preferred interpretation nowadays is that the listric faults formed through extension in the brittle upper crust was actually the products of ductile stretching in the lower crust, while the formation of the basins was controlled by these faults. 2. On the base of the listric basement fault, there may further occur the listric growth fault. Their formation mechanism was remarkably different from the listric basement fault in that they not only were controlled by extension, buy, what is more important, could be formed mainly as a result of gravity or pressure difference of sediments. This sort of faults are rather widespread in Mesozoic-Cenozoic basins in east China. 3. In the large-size basins of east China, the downward extension or the bottom of the listric normal faults is generally in the range of 5-15 km below the surface, as can be examplified by the well-known Cangdong and Shengbei basement faults. 4. Jn the basin controlled by extension and stretching, the original geological boundaries, such as bedding surface, boundary between the cover an
Producing Terahertz Conherent Synchrotron Radiation Based On Hefei Light Source
Xu De-Rong,Xu Hong-Liang,Shao Yan
Physics , 2014,
Abstract: This paper theoretically proves that an electron storage ring can generate coherent radiation in THz region using a quick kicker magnet and an ac sextupole magnet. When the vertical chromaticity is modulated by the ac sextupole magnet, the vertical beam collective motion excited by the kicker produces a wavy spatial structure after a number of longitudinal oscillation periods. We calculate the radiation spectral distribution from the wavy bunch in Hefei Light Source(HLS). If we reduce electron energy to 400MeV, it can produce extremely strong coherent synchrotron radiation(CSR) at 0.115THz.
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