检索结果-南通市图书馆

Effects of Carrier Gas on Carbon Incorporation in GaN

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第3期31卷 122-124页

作者： zhang Jian-Li LIU Jun-Lin PU yong FANG wen-Qing zhang Meng JIANG Feng-Yi National Engineering and Technology Research Center for LED on Si Substrate Nanchang University Nanchang 330047

GaN epitaxial layers were grown on Si （111） substrates by metal organic chemical vapor deposition. Carbon concentrations in the films grown in different ambients were measured by secondary ion mass spectrometry. The results show that the carbon incorporation is strongly dependent on the H2 flow rate when the NH3 flow rate is small, but insensitive to the H2 flow rate when the NH3 flow rate is sufficient large. We conclude that H2 can inhibit the dissociation of NH3 and result in a less active N source; an insufficiently active N source causes more N vacancies, which enhances carbon incorporation.

关键词： Gallium nitride

Combination of Recombinant Adenovirus-p53 with Radiochemotherapy in Unresectable Pancreatic Carcinoma

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2011年第3期23卷 194-200页

作者： Jin-luan Li yong Cai Shan-wen zhang Shao-wen Xiao Xiao-fan Li You-jia Duan yong-heng Li Bo Xu Kun Yan Key Laboratory of Carcinogenesis and Translational Research （Ministry of Education） 1Department of Radiotherapy2Department of UltrasonographyPeking University School of OncologyBeijing Cancer Hospital ＆ InstituteBeijing 100142China

Objective：To assess the safety and efficacy of the combination of recombinant adenovirus-p53 （rAd-p53） with radiochemotherapy for treating unresectable pancreatic ***：The eligible patients received concurrent rAd-p53 intratumoral injection and *** injection of rAd-p53 was guided by B *** consisted of intensity-modulated radiotherapy （IMRT） at two dose levels and intravenous gemcitabine （Gem）.For radiotherapy,gross target volume （GTV） and clinical target volume （CTV） were 55-60 Gy and 45-55 Gy in 25-30 fractions,*** intravenous gemcitabine was administered at 350 mg/m2,weekly,for 6 *** primary end points included toxicity,clinical benefit response （CBR） and disease control rate （DCR）.The secondary end points included progression-free survival （PFS） and overall survival （OS）.Results：Fifteen eligible patients were *** patients （53.3%） were evaluated as CBR and 12 （80%） achieved *** median PFS and OS were 6.7 and 13.8 months,***-year PFS and OS were 40.0% and 51.1%,*** were 8 （53.3%） patients reported grade 3 toxicities including neutropenia （6 patients,40%）,fever （1 patient,6.7%） and fatigue （1 patient,6.7%）.There was no grade 4 toxicity ***：Combination of rAd-p53 in unresectable pancreatic carcinoma showed encouraging efficacious benefit and was well ***-term follow-up is needed to confirm the improvement of PFS and OS.

关键词： Recombinant adenovirus-p53 Radiochemotherapy Pancreatic carcinoma

A Facile Strategy for Intrinsic Low-Dk and Low-Df Polyimides Enabled by Spirobifluorene Groups

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第2期41卷 288-296页

作者： Wan-Yi Tan Ling-Feng Jian Wei-Peng Chen yong-wen zhang Xiao-Chuang Lu Wan-Jun Huang Ji-Sheng zhang Jing-Wu Wu Jun-Li Feng Yi-Dong Liu Ting-Ting Cui yong-Gang Min Guangdong University of Technology(GDUT) Guangzhou510006China Huimai Materials Technology(Guangdong)Co. Ltd.Foshan528200China Shenzhen Customs Industrial Product Inspection Technology Center Shenzhen518026China

Modified polyimides(MPIs)show great potential towards 5G communication applications,due to its excellent thermal stability,mechanical property and chemical stability as compared to most of *** fluoride groups or porous structure is favorable to ultra-low dielectric constant(D_(k))and dielectric loss(D_(f)).However,the cost of the fluorinated MPIs is high and their synthetic processes are complicated,and porous MPIs suffer poor mechanical ***,increasing the fraction of free volume is a very effective way to lower D_(k)through introducing more ultra-low-D_(k)air ***,most of this kind of MPIs lag far behind the fluorinated MPIs and the porous MPIs in terms of ultra-low D_(f),hindering the application of MPIs in high-speed communication ***,it is highly desirable to develop intrinsic ultra-low-D_(k)/D_(f)MPIs at high frequency with less fluoric groups and nonporous ***,we introduce a facile and effective strategy to lower D_(k)and D_(f)through introducing rigid and large sterically hindered aromatic groups into *** the one hand,their large steric hindrance effect leads to low D_(k)by increasing intrinsic free *** the other hand,the resulting highly stiff polymer chain and strong intermolecular interaction are favorable to reduce D_(f)by inhibiting dipole *** on this strategy,the spirobifluorene groups are *** as-prepared MPIs show excellent dielectric performance with low D_(k)of 2.74–2.76 and low D_(f)of 0.00599 at 10 GHz,to some extent,exceeding the multiple fluorinated MPI with D_(k)/D_(f)of 2.67/0.00663 at 10 GHz.

关键词： Polyimide High speed communication Low dielectric constant Low dielectric loss

Software framework for off-road autonomous robot navigation system

在线全文

学校读者我要写书评

暂无评论

重庆邮电大学学报（自然科学版） 2009年第2期21卷 178-183页

作者： WU Er-yong ZHOU wen-hui zhang Li DAI Guo-jun Department of Computer Science Hangzhou Dianzi Univeristy Xiasha District Hangzhou 310018 P. R. China

This paper presents a software framework for off-road autonomous robot navigation *** the requirements of accurate terrain perception and instantaneous obstacles detection,one navigation software framework was advanced based on the principles of "three layer architecture" of intelligence *** the technologies of distributed system,machine learning and multiple sensor fusion,individual functional module was *** paper aims to provide a framework reference for autonomous robot navigation system design.

关键词：自主机器人导航系统软件框架多传感器融合分布式系统障碍检测情报系统三层结构

Impact of Blood Clot in Oocyte-Corona-Cumulus Complex during in vitro Fertilization and Embryo Transfer

在线全文

学校读者我要写书评

暂无评论

Journal of Reproduction and Contraception 2012年第1期23卷 57-63页

作者： Yu-ling HUANG Xiao-ling LONG yong FAN wen-hong zhang Hong-zi DU Assisted Reproductive Center the Third Affiliated Hospital of Guangzhou Medical CollegeKey Laboratory for the Major Obstetric Disease in Guangdong ProvinceGuangzhou 510150China

Objective To study the impact of blood clots in the oocyte-corona-cumulus complexes （OCCC） during in vitro fertilization and embryo transfer （IVF-ET）.Methods The OCCCs were harvested from the patients undergoing long protocol ovarian hyperstimulation. The OCCCs with blood clots removed or not, were randomly grouped into A or B. The OCCCs without blood clots were group C （the control）.Results The patient＇s age, infertility duration, the average GN consumption, the average days of superovulation and an average number of harvested oocytes showed no significant difference in the 3 groups. The fertilization rate and 2PN rate in group A were the highest, which were 85.4% and 71.1%, respectively, followed by group C, which were 77.5% and 64.9%, respectively. The lowest fertilization rate and 2PN rate were in group B, 75.8% and 62.2%, respectively. Those in group A were significantly higher than those in groups B and C （P〈0.01）, while there was no significant difference between group B and group C. The implantation rates and pregnancy rates showed no significant difference in the 3 groups after transplantation, even if group A got the highest rate among the 3 groups. Conclusion Removing the blood clots in OCCC can improve the outcome of IVF-ET without increasing the cost and complexity of the operation.

关键词： in vitro fertilization and embryo transfer (IVF-ET) blood clot fertilization rate pregnancy

Brain metastasis treated with Cyberknife

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2009年第16期122卷 1847-1850页

作者： WANG Zhi-zhen YUAN Zhi-yong zhang wen-cheng YOU Jin-qiang WANG Ping Key Laboratory of Cancer Prevention and Therapy and Department of Radiation Therapy Tianjin Cancer Hospital of Tianjin Medical University Tianjin 300060 China

Background Cyberknife can greatly raise the fractional dose of stereotactic radiosurgery, thus improving its clinical efficacy. We retrospectively analyzed clinical outcomes of brain metastasis treated with Cyberknife. Methods We analyzed 40 cases of brain metastases treated with Cyberknife in the Tianjin Cancer Hospital from August 1, 2006 to August 1, 2007, for a total of 68 lesions with maximal diameter of 0.4-7.5 cm （average 1.88 cm）. Total hypofractional radiated dosage was 18-36 Gy （5-25 Gy/F, 1-5 F） by Cyberknife. We evaluated the remission rate of clinical symptoms, correlation factors to new foci, 3-month local control rates, and 3-month and 1-year survival rates. All patients were followed up for more than 14 months. Results After 1 week, clinical remission was 90.0% （36/40）. After 3 months, the local control rate and therapeutic effective rate were 77.9% （53/68） and 94.1% （64/68）, respectively, as observed by cranium augmentation CT or MRI. The three-month, six-month and 1-year survival rates were 97.5% （39/40）, 82.5% （33/40） and 67.5% （27/40）, respectively. Fourteen patients had neopathy outside the original lesion after 3 months. Neopathy was not correlated with age, whole-brain radiotherapy, number of original lesions, maximum diameter of the original lesion, therapeutic dose per fraction, therapeutic frequency or total therapeutic dose. Conclusions Cyberknife got perfect clinical outcomes by higher dosage per fraction. It is an appropriate and valid treatment shortcut for brain metastasis.

关键词： Cyberknife brain tumor metastasis clinical practice whole brain radiotherapy

Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： Feng zhang Chenyang zhang Linlin Wu Wei Sun Hongliang zhang Jianhua Chen yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

Management of sternal osteomyelitis and mediastinal infection following median sternotomy

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第20期123卷 2803-2806页

作者： GAO Ju WANG You-li LU Shu-qiang CAI Ai-bing YANG Zhi-fu HAN Zhi-yi LI Jiu-jiang wen Yu-ming GENG Feng-yong WANG wen-zhang Third Department of Surgery Hospital of Aviation Industry Corporation of ChinaBeijing 100012China

Background Median sternotomy is considered the most usually performed procedure in cardiac operations. This study aimed to assess clinical effectiveness of bilateral pectoralis major muscle flaps （BPMMF） for management of sternal osteomyelitis and mediastinal infection following median *** Clinical data were collected and retrospectively analyzed from twelve patients who underwent the BPMMF transposition for management of sternal osteomyelitis and mediastinal infection following median sternotomy from January 2006 to June 2009. Procedure consisted of rigorous debridement of necrotic tissues, dead space obliteration using the BPMMF, and placement of drainage tubes connected to a negative pressures generator for adequate *** No patients died of drainage, and all 12 patients had viable BPMMF when discharged from hospital. At 1 week post discharge, 2 patients presented with sternal infection but recovered following local debridement and medication. No patients showed infection recurrence during the follow-up period over 10 *** Sternal osteomyelitis and mediastinal infection following median sternotomy may be effectively managed through rigorous debridement of infected soft tissues, resection of the damaged stermal segment, transposition of the BPMMF to fill the damaged sternum resulting from debridement, and adequate postoperative drainage.

关键词： median sternotomy sternal osteomyelitis mediastinal infection muscle flaps management

Simplified Model for Evaluation of VIV-induced Fatigue Damage of Deepwater Marine Risers

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2009年第4期14卷 435-442页

作者：薛鸿祥唐文勇张圣坤 State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

A simplified empirical model for fatigue analysis of deepwater marine risers due to vortex-induced vibration (VIV) in non-uniform current is presented. A simplified modal vibration equation is employed according to the characteristics of deepwater top tensioned risers. The response amplitude of each mode is determined by a balance between the energy feeding into the riser over the lock-in regions and the energy dissipated by the fluid damping over the remainder based on the data from self-excited oscillation and forced oscillation experiments of rigid cylinders. Multi-modal VIV fatigue loading is obtained by the square root of the sum of squares approach. Compared with previous works, this model can take fully account of the main intrinsic natures of VIV for low mass ratio structures on lock-in regions, added mass and nonlinear fluid damping. In addition, a closed form solution of fatigue damage is presented for the case of a riser with uniform mass and cross-section oscillating in a uniform flow. Fatigue analysis of a typical deepwater riser operating in Gulf of Mexico and West Africa shows that the current velocity profiles affect the riser’s fatigue life significantly and the most dangerous locations of the riser are also pointed out.

关键词： deepwater riser vortex-induced vibration (VIV) fatigue damage simplified model