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Search Results: 1 - 10 of 68364 matches for " MA Wen-qi "
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Hopf bifurcation from synchronous chaos and its circuit simulation in a coupled nonlinear oscillator system
一类耦合非线性振子同步混沌Hopf分岔及其电路仿真

Ma Wen-Qi,Yang Cheng-Hui,
马文麒
,杨承辉

物理学报 , 2005,
Abstract: For a coupled nonlinear oscillator system with diffusion and gradient couplings, spatial Fourier transformation is performed and the dynamic equations of various space modes are derived. By calculating the Lyapunov exponents of the transverse modes, one can determine the stable region of the synchronous chaos on the plane of coupling parameters. On the boundary of the stable region, a couple of conjugate transverse modes destabilize, and a Hopf bifurcation takes place. Numerical simulations are carried out for the coupled Lorenz oscillator system. An electronic circuit is designed for simulating the bifurcation in the system. Results from the simulations show that the frequency created by the Hopf bifurcation is equal to the oscillation frequency of the destabilized transverse modes.
CORROSION FAILURE ANALYSIS FOR CAUSTIC-FUSION PAN
碱熔锅腐蚀性能实验及腐蚀原因分析

MA Jun,TANG Wen-qi,CHEN Jin,
马骏
,唐文麒,陈进

腐蚀科学与防护技术 , 2006,
Abstract: Through observation and analysis of a failed caustlc-fusion pan of resoreinol equipment in a chemical factory, whilst various physical testing and chemical analysis of the failed pan and corrosion products were done.A simulated test unit was set up and ~me simulated corrosion tests were done, The result proved that the eaustie-fussion pan was corroded seriously by the concentrated caustic solutions at high temperature, In terms of the test results, a few methods were put forward to increas the life of caustie-fussion pans.
SPIN-1 (3-LEVEL) MODEL OF NMR LASER DRIVEN BY AN EXTERNAL SIGNAL

QU ZHI-LIN,YANG GUO-JIAN,MA WEN-QI,HU GANG,

中国物理 B , 1994,
Abstract: A set of NMR laser equations is presented for a spin-1 model under the assumption that the system is homogeneously broadened and spatially independent. The steady state solutions are obtained and their instabilities are revealed. The results are compared with the spin-1/2 model. Multi-codimensional bifurcation points are found.
A Constructive Algorithm to Prove P=NP
Wen-Qi Duan
Computer Science , 2012,
Abstract: After reducing the undirected Hamiltonian cycle problem into the TSP problem with cost 0 or 1, we developed an effective algorithm to compute the optimal tour of the transformed TSP. Our algorithm is described as a growth process: initially, constructing 4-vertexes optimal tour; next, one new vertex being added into the optimal tour in such a way to obtain the new optimal tour; then, repeating the previous step until all vertexes are included into the optimal tour. This paper has shown that our constructive algorithm can solve the undirected Hamiltonian cycle problem in polynomial time. According to Cook-Levin theorem, we argue that we have provided a constructive proof of P=NP.
UNSTABLE REGION AND BIFURCATIONS AND CHAOS IN SINGLE-MODE BISTABLE OPTICAL SYSTEMS
单模光学双稳系统的不稳定区整体分布及分岔与混沌

MA WEN-QI,YANG GUO-JIAN,HU GANG,
马文骐
,杨国健,胡岗

物理学报 , 1989,
Abstract: 本文根据半经典Maxwell-Bloch方程单模光学双稳系统的稳定性判据,在Δ-θ参数平面上描绘该系统不稳定区的整体分布(这里Δ和θ分别正比于原子与腔相对输入场的失谐度)。在已知的不稳定区中,具体讨论了系统的分岔与混沌性质。在双稳曲线的上、下支上同时发现混沌现象,找到了与稳定定态解共存的新的非定态解。
Comparative Analysis of the Superiority of China''s Phosphate Rock and Development Strategies with that of the United States and Morocco
中国、美国、摩洛哥磷矿资源优势及开发战略比较分析

ZHANG Wei-feng,MA Wen-qi,ZHANG Fu-suo,MA Ji,
张卫峰
,马文奇,张福锁,马骥

自然资源学报 , 2005,
Abstract: 从资源保护和优化利用的角度出发,比较了中国、美国、摩洛哥三国磷矿石的储量、品位、重金属含量、矿产集中度、运输距离等,发现摩洛哥磷矿资源具有极强的优势,而美国资源也要优于中国.在比较了矿产开发规模、回采率、产量、成本、可利用年度等指标后,发现美国与摩洛哥各有优劣,而中国明显落后.根据磷肥生产量估算,2003年中国磷矿实际消耗量达到10 558×104t标矿.根据现有开采水平和消费量估算,世界磷矿可以满足100年内的需求,但是中国P2O5≥30%的富矿资源仅能利用到2014年,提高回采率可能会达到2022年.中国磷矿资源开发策略欠佳,浪费严重、经济效益低下,导致远景供应堪忧.针对以上问题,提出了我国磷矿资源合理利用的若干建议.
A Novel System for Producing Lentiviral Vectors
一种新型慢病毒载体制备方法的建立

MA Qiang,LI Ming,DONG Wen-Qi,WU Ying-Song,
马强
,李明,董文其,吴英松

生物工程学报 , 2007,
Abstract: The aim was to develop a cell culture system capable of producing high titer lentiviral vector stocks with recombinant vaccinia viruses as helpers. BHK21 was co-transfected by three main plasmids containing the transducing plasmid pVECRNA, the packaging plasmid pGAGPOL and the envelop plasmid pVSVG, and thereafter infected with the vaccinia vTF-3 containing bacteriophage T7 RNA polymerase gene using Lipofectamine2000. After 4 days incubation, the culture supernatant of lentiviral vectors was collected and judged by RT-PCR and the Western blot, the results showed that lentiviral vectors were found in the culture supernatant; approximately (11.71 +/- 0.80) x 10(11) copies of lentiviral vector RNA were present per mL of cell culture supernatant, as detected by Real-time PCR; the vector stocks with titers was up to (1.3 +/- 0.18) x 10(8) tu/mL, as detected by flow cytometry , which is one order of magnitude higher than the output of classical manufacture system. These results suggest that the new poxviral/lentiviral hybrid system for efficient lentiviral vector production was initially established. It provides the basis for the future development of industrial application.
Effects of different acidic materials on pH value of calcareous soil
不同酸性物质对石灰性土壤的酸化效果研究

YAO Xiao-Qin,MA Wen-Qi,CHU Jian -Zhou,
姚晓芹
,马文奇,楚建周

中国生态农业学报 , 2006,
Abstract: 采用室内模拟试验研究了酸性物质对石灰性土壤的酸化效果。结果表明,磷酸能有效地降低石灰性土壤的pH,要使土壤pH由8.89降至6.0左右,最佳酸用量为3.27g/100g土。对于pH较高的石灰性土壤,只用低pH(pH=5.5)的酸水溶液在短时间内降低土壤pH是不切实际的。磷酸二氢铵不仅具有很好的酸化效果,且具有很好的缓冲性能,每100g土壤加入2.3g磷酸二氢铵可使石灰性土壤pH从8.89降低到6.39,并能维持较长的酸性环境。施用5%的硫磺可在30d内使土壤pH降低到7.0~7.5之间。
Fertilizer Production and Consumption and the Resources, Environment, Food Security and Sustainable Development in China
关乎我国资源、环境、粮食安全和可持续发展的化肥产业

MA Wen-qi,ZHANG Fu-suo,ZHANG Wei-feng,
马文奇
,张福锁,张卫锋

资源科学 , 2005,
Abstract: 本文根据多年研究结果,总结和分析了我国化肥生产消费与资源开发利用、环境保护及可持续发展的关系.指出我国已经成为世界化肥生产消费大国,到2002年,化肥生产量达到0.379×108t,化肥消费量为0.434×108t,分别占世界总量的25%和30.7%,并且化肥品种向高浓度化发展.化肥消费的增多,保证了我国粮食安全,减缓了土壤养分缺乏,但目前主要作物施肥量较高,与先进国家相比,养分效率偏低,有大量有机养分没有得到很好利用.化肥生产需要消耗磷硫钾氨资源,特别是磷矿资源浪费严重,隐藏危机.化肥产业的发展还带来一定的环境问题,包括重金属和氮磷排放等方面需要引起重视.化肥发展要适度规模,核心问题是提高养分资源利用效率.
阿瑞匹坦在消化道肿瘤中预防中度致吐性化学治疗药物所致恶心 呕吐的临床观察#br#
Aprepitant therapy for prevention of moderately chemotherapy-induced nausea and vomiting in patients with gastrointestinal cancer#br#

奚文崎,陆莉,蒋金玲,马韬,张俊
XI Wen-qi
, LU Li, JIANG Jin-ling, MA Tao, ZHANG Jun

- , 2017, DOI: 10.3969/j.issn.1674-8115.2017.08.016
Abstract: 目的 · 探讨阿瑞匹坦联合帕洛诺司琼和地塞米松方案在预防中度致吐性化学治疗(化疗)方案治疗消化道肿瘤所致的恶心 呕吐的作用。方法 · 纳入2014 年 7 月至2015 年 8 月在上海交通大学医学院附属瑞金医院肿瘤科住院接受中度致吐性化疗方案的消 化道肿瘤患者130 例。所有患者均完成4 个周期以上的化疗。109 例在第1 周期化疗开始时即使用阿瑞匹坦、帕洛诺司琼和地塞米 松(第 1 日),第2 ~ 3 日使用阿瑞匹坦和地塞米松;21 例在第1 周期化疗使用帕洛诺司琼、地塞米松(第1 日),第2 ~ 3 日使用地 塞米松,未使用阿瑞匹坦,在第 2 周期及后续化疗中均在第 1 ~ 3 日加用阿瑞匹坦。患者完成 MASCC 止吐工具量表。主要研究终点是 第 2 周期化疗全程(0 ~ 120 h)的完全缓解(无呕吐及无挽救治疗),次要研究终点是第2 周期化疗全程、急性期(0 ~ 24 h)和延迟 期(24 ~ 120 h)的完全保护(无呕吐及无明显恶心)。结果 · 第2周期全程、急性期、延迟期完全缓解率分别为 90.0%、94.6%、90.8%。 第2周期全程、急性期、延迟期的完全保护率分别为 83.8%、87.8%、84.6%。21 例患者在第 2周期加用阿瑞匹坦后急性期完全缓解率由 42.9% 提高至57.1%,延迟期完全缓解率由9.5% 提高至90.5%。主要不良反应为便秘、食欲减退、呃逆。结论 · 阿瑞匹坦联合帕洛诺司 琼、地塞米松的三联止吐方案能够有效预防消化道肿瘤中度致吐性化疗所致恶心呕吐的发生,且能在多周期化疗中维持有效的止吐疗效。
:Objective · To investigate antiemetic effect of aprepitant for moderately chemotherapy-induced nausea and vomiting in patients with gastrointestinal cancer. Methods · From 2014 July to 2015 August, 130 cases of gastrointestinal cancer patients were collected in Ruijin Hospital affiliated to Shanghai Jiao Tong University School of Medicine, who received moderate emetogenic risk of chemotherapy for at least four courses. One hundred and nine patients were treated with aprepitant, palonosetron and dexamethasone on day 1, and aprepitant and dexamethasone on day 2 and 3. Twenty-one patients only received aprepitant and dexamethasone on day 1 and dexamethasone on day 2 and 3 in the first course of chemotherapy. During subsequent courses of chemotherapy they received aprepitant and treated in the same way as 109 patients. MASCC antiemetic tool (MAT) was used to evaluate the intensity of nausea. The primary endpoint was complete response (CR, no emesis and use of no rescue antiemetics) during the overall study phase (0-120 h after chemotherapy) at the second course. The secondary endpoint was complete protection (CP, CR plus no significant nausea) during the overall, acute (0-24 h), and delayed (24-120 h) phases at the second course. Results · The CR rates were 90.0%, 94.6% and 90.8% of patients in the overall, acute and delayed phases, respectively. The corresponding CP rates were 83.8%, 87.8% and 84.6 %, respectively. The CR rate increased from 42.9% to 57.1% during acute phase and increased from 9.5% to 90.5% during delayed phase for 21 patients after treatment with aprepitant. The main adverse reactions include constipation, anorexia and hiccups. Conclusion · Aprepitant combined with palonosetron and dexamethasone can effectively prevent moderately chemotherapy-induced nausea and vomiting in patients with gastrointestinal cancer. Aprepitant therapy can effectively maintain
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