检索结果-南通市图书馆

Artificial synthesis of polyesters at ambient condition via consecutive CO_(2)electrolysis and fermentation

Nano Research 2024年第7期17卷 6016-6025页

作者： Guiru Zhang Ning Ji Shiheng Lyu Baoxin Ni Peng Shen ke Ye Yuting wang Xuheng jiang hai Zhang Xi Liu Yongcheng wang Kun jiang Department of Laboratory Medicine of The First Affiliated Hospital&Liangzhu Laboratory Zhejiang University School of MedicineHangzhou 310058China Interdisciplinary Research Center School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China In-situ Centre for Physical Sciences Frontiers Science Center for Transformative MoleculesSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Electrochemically converting CO_(2)into value-added chemicals is a promising approach to mitigate anthropogenic carbon emissions,yet largely limited to short-chained C_(1)–C_(3)***,we demonstrate a tandem artificial synthesis of biodegradable polyhydroxybutyrate(PHB)plastic from CO_(2)building *** synthesis of defects-enriched Bi catalyst is firstly demonstrated by plasma bombardment and following in situ electrochemical reduction,which delivers a HCOOH Faradaic efficiency above 80%at tunable concentration from 2 to 250 mM,an energy efficiency up to 41%,and a single-pass carbon conversion efficiency up to 60%.Annular dark field and second electron microscopic analysis,density functional theory(DFT)calcualtions,coupled with H-type and solid-state electrolyzer assessments,point out the vital role of defective and/or stepped Bi surface sites in promoting CO_(2)-to-HCOOH ***,as-synthesized high-purity HCOOH is used as the sole carbon source for C-chain growth within microbial fermentation reactor with Ralstonia eutropha,where activated formate dehydrogenase and increased metabolites related to Calvin–Benson–Bassham cycle are found to be responsible for the enhanced polyester accumulation.

关键词： CO_(2)electrolysis Bi catalyst vacancy site formic acid fermentation

来源：

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

Multigraphic Degree Sequences and Hamiltonian-connected Line Graphs

引用

Acta Mathematicae Applicatae Sinica 2021年第4期37卷 800-806页

作者： Ren-sen MA ai-mei YU ke-ke wang Hong-Jian Lai Department of Mathematics Beijing Jiaotong UniversityBeijing100044China Department of Mathematics Embry-Riddle Aeronautical UniversityPrescottAZUSA Department of Mathematics West Virginia UniversityMorgantownWVUSA

Let G be a *** that e=u1v1 and e′=u2v2 are two edges of *** e≠e′,then G(e,e′)is the graph obtained from G by replacing e=u1v1 with a path u1vev1 and by replacing e′=u2v2 with a path u2ve′v2,where ve,ve′are two new vertices not in V(G).If e=e′,then G(e,e′),also denoted by G(e),is obtained from G by replacing e=u1v1 with a path u1vev1.A graph G is strongly spanning trailable if for any e,e′∈E(G),G(e,e′)has a spanning(ve,ve′)-*** design of n processor network with given number of connections from each processor and with a desirable strength of the network can be modelled as a degree sequence realization problem with certain desirable graphical properties.A sequence d=(d1,d2,⋯,dn)is multigraphic if there is a multigraph G with degree sequence d,and such a graph G is called a realization of d.A multigraphic degree sequence d is strongly spanning trailable if d has a realization G which is a strongly spanning trailable graph,and d is line-hamiltonian-connected if d has a realization G such that the line graph of G is *** this paper,we prove that a nonincreasing multigraphic sequence d=(d1,d2)⋯,dn)is strongly spanning trailable if and only if either n=1 and d1=0 or n≥2 and dn≥*** this result,we prove that for a nonincreasing multigraphic sequence d=(d1,d2,⋯,dn),if n≥2 and dn≥3,then d is line-hamiltonian-connected.

关键词： strongly spanning trailable graphs multigraphic degree sequence hamiltonian-connected graphs line graph

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Self-starting all-fiber PM Er:laser mode locked by a biased nonlinear amplifying loop mirror

引用

Chinese Physics B 2019年第12期28卷 160-164页

作者： ke Yin Yi-Ming Li Yan-bin wang Xin Zheng Tian jiang National Innovation Institute of Defense Technology Academy of Military Sciences PLA ChinaBeijing 100071China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China State key Laboratory of High Performance Computing College of ComputerNational University of Defense TechnologyChangsha 410073China Luoyang Electronic Equipment Test Center of China Luoyang 471003China

A compact all-fiber polarization-maintaining Er:laser using a nonlinear amplifying loop mirror is reported. Fundamental single-pulse mode-locking operation can always self start, with a cavity round-trip decreased from ~ 4.7 m to~ 1.7 m. When the pulse repetition rate is 121.0328 MHz, output pulse is measured to have a center wavelength/3-d B spectral bandwidth/radio frequency signal to noise ratio(SNR)/pulse width of 1571.65 nm/18.70 nm/80 d B/477 fs, respectively. Besides, three states including the exponential growth, damping state, and steady state are investigated through the build-up process both experimentally and numerically. Excellent stability of this compact Er:laser is further evaluated,demonstrating that it can be an easy-fabrication maintenance-free ultrafast candidate for the scientific area of this kind.

关键词： ultrafast fiber laser single-mode polarization-maintaining Er:laser

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Natural orifice transluminal endoscopic wedge hepatic resection with a water-jet hybrid knife in a non-survival porcine model

引用

World Journal of Gastroenterology 2011年第7期17卷 926-931页

作者： Hong Shi Sheng-Jun jiang bin Li Deng-ke Fu Pei Xin Yong-Guang wang Institute of Minimally Invasive Medicine Tongji University Shanghai200092 China Department of Minimally Invasive Sur-gery Beijing Chuiyangliu Hospital Beijing 100022 China

aiM: To explore the feasibility of a water-jet hybrid knife to facilitate wedge hepatic resection using a natural orifice transluminal endoscopic surgery (NOTES) approach in a non-survival porcine model. METHODS: The Erbe Jet2 water-jet system allows a needleless, tissue-selective hydro-dissection with a pre-selected pressure. Using this system, wedge hepatic resection was performed through three natural routes (trans-anal, trans-vaginal and trans-umbilical) in three female pigs weighing 35 kg under general anesthesia. Entry into the peritoneal cavity was via a 15-mm incision using a hook knife. The targeted liver segment was marked by an APC probe, followed by wedge hepatic resection performed using a water-jet hybrid knife with the aid of a 4-mm transparent distance soft cap mounted onto the tip of the endoscope for holding up the desired plane. The exposed vascular and ductal structures were clipped with Endoclips. Hemostasis was applied to the bleeding cut edges of the liver parenchyma by electrocautery. After the procedure, the incision site was left open, and the animal was euthanized followed by necropsy. RESULTS: Using the Erbe Jet2 water-jet system, trans-anal and trans-vaginal wedge hepatic resection was successfully performed in two pigs without laparoscopic assistance. Trans-umbilical attempt failed due to an unstable operating platform. The incision for peritoneal entry took 1 min, and about 2 h was spent on excision of the liver tissue. The intra-operative blood loss ranged from 100 to 250 mL. Microscopically, the hydro-dissections were relatively precise and gentle, preserving most vessels. CONCLUSION: The Erbe Jet2 water-jet system can safely accomplish non-anatomic wedge hepatic resection in NOTES, which deserves further studies to shorten the dissection time.

关键词： Natural orifice transluminal endoscopic surgery Hepatic resection Water-jet Hybrid knife Triangulation

来源：

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

Potential protective effects of Clostridium butyricum on experimental gastric ulcers in mice

引用

World Journal of Gastroenterology 2015年第27期21卷 8340-8351页

作者： Fang-Yan wang Jia-Ming Liu hai-Hua Luo ai-Hua Liu Yong jiang State key Laboratory of Organ Failure Research Nanfang Hospital key Laboratory of Transcriptomics and Proteomics of Ministry of Education of China Key Laboratory of Proteomics of Guangdong Province Department of Pathophysiology Southern Medical University Department of Pathophysiology Wenzhou Medical University School of Environmental Science and Public Health Wenzhou Medical University

aiM: To investigate the effects of Clostridium butyricum(C. butyricum) on experimental gastric ulcers(GUs) induced by alcohol, restraint cold stress, or pyloric ligation in mice, ***: One hundred and twenty mice were randomly allocated into three types of gastric ulcer models(n = 40 each), induced by alcohol, restraint cold stress, or pyloric ligation. In each GU model, 40 mice were allocated into four groups(n = 10 each): the sham control group; model group(GU induction without pretreatment); C. butyricum group(GU induction with C. butyricum pretreatment); and Omeprazole group(GU induction with Omeprazole pretreatment). Theeffects of C. butyricum were evaluated by examining the histological changes in the gastric mucosal erosion area, the activities of superoxide dismutase(SOD) and catalase(CAT), the level of malondialdehyde(MDA), and the contents of interleukin(IL)-1b, tumor necrosis factor(TNF)-α, leukotriene B4(LTB4) and 6-keto-PGF-1α(degradation product of PGI2) in the gastric ***: Our data showed that C. butyricum significantly reduced the gastric mucosal injury area and ameliorated the pathological conditions of the gastric mucosa. C. butyricum not only minimized the decreases in activity of SOD and CAT, but also reduced the level of MDA in all three GU models used in this study. The accumulation of IL1-b, TNF-α and LBT4 decreased, while 6-keto-PGF-1α increased with pretreatment by C. butyricum in all three GU ***: Our data demonstrated the protective effects of pretreatment with C. butyricum on antioxidation and anti-inflammation in different types of GU models in mice. Further studies are needed to explore its potential clinical benefits.

关键词： Inflammation Probiotics Oxidative stress Clostridium butyricum Gastric ulcer

来源：

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

Deformation-based freeform feature reconstruction in reverse engineering

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第9期9卷 1214-1228页

作者： Qing wang jiang-xiong LI Ying-lin ke State key Lab of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

For reconstructing a freeform feature from point cloud, a deformation-based method is proposed in this paper. The freeform feature consists of a secondary surface and a blending surface. The secondary surface plays a role in substituting a local region of a given primary surface. The blending surface acts as a bridge to smoothly connect the unchanged region of the primary surface with the secondary surface. The secondary surface is generated by surface deformation subjected to line constraints, i.e., character lines and limiting lines, not designed by conventional methods. The lines are used to represent the underlying informa-tion of the freeform feature in point cloud, where the character lines depict the feature’s shape, and the limiting lines determine its location and orientation. The configuration of the character lines and the extraction of the limiting lines are discussed in detail. The blending surface is designed by the traditional modeling method, whose intrinsic parameters are recovered from point cloud through a series of steps, namely, point cloud slicing, circle fitting and regression analysis. The proposed method is used not only to effectively and efficiently reconstruct the freeform feature, but also to modify it by manipulating the line constraints. Typical examples are given to verify our method.

关键词： Freeform feature Surface deformation Fishbone structure Character line Limiting line Reverse engineering

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical study of PV/T-SAHP system

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第7期9卷 970-980页

作者： Gang PEI Jie JI ke-liang LIU Han-feng HE ai-guo jiang Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230027 China

In order to utilize solar energy effectively and to achieve a higher electrical efficiency by limiting the operating temperature of the photovoltaic （PV） panel, a novel photovoltaic/thermal solar-assisted heat pump （PV/T-SAHP） system was proposed and constructed. The hybrid solar system generates electricity and thermal energy simultaneously. A distributed parameters model of the PWT-SAHP system was developed and applied to analyze the system dynamic performance in terms of PV action, photothermal action and Rankine cycle processes. The simulation results indicated that the coefficient of performance （COP） of the proposed PV/T-SAHP can be much better than that of the conventional heat pump. Both PV-efficiency and photothermic efficiency have been improved considerably. The results also showed that the performance of this PV/T-SAHP system was strongly influenced by the evaporator area, tube pitch and tilt angle of the PV/T evaporator, which are the key factors in PV/T-SAHP system optimization and PV/T evaporator design.

关键词： Photovoltaic (PV) Photothermic Heat pump Photovoltaic/thermal (PV/T) evaporator

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Physiological responses and detoxific mechanisms to Pb,Zn,Cu and Cd in young seedlings of Paulownia fortunei

引用

Journal of Environmental Sciences 2010年第12期22卷 1916-1922页

作者： jiang wang Weihua Li Chongbang Zhang Shisheng ke School of Life Sciences Taizhou University Linhai 317000 China key Laboratory of Ecology and Environmental Science in Guangdong Higher Education College of Life Sciences South China Normal University Guangzhou 510631 China

Paulownia fortunei has been successfully used in the phytoremediation of many Pb/Zn mine tailings. However, seed germination and young seedlings of P. fortunei rarely occurred in these mine tailings. The physiological responses and detoxific mechanisms of P. fortunei young seedling to Pb, Zn, Cu and Cd stress were investigated. The germinated rate, shoot length, chlorophyll and carotenoid contents in leaves of young seedlings had a great reduction under Zn and Cu treatments, but had little decrease under Pb and Cd treatments. The production rate of O2＊-, H2O2 and malondialdehyde （MDA） contents significantly increased in response to added Zn and Cu indicating great oxidative stress for young seedlings, but they had no significant change to added Pb and Cd. Young seedlings had effective detoxific mechanism to Pb and Cd, as antioxidant enzymes activities, phytochelatins （PCs-SH） and proline contents increased with increasing rates of added Pb and Cd. However, young seedlings had un-effective detoxific mechanisms to Zn and Cu stress. Results revealed the heavy metals （such as Ca） that present at low concentrations in mine tailings may be major constraint for the survival of young seedlings.

关键词： heavy metals defense system oxygen species antioxidant enzyme phytochelatins

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Corrosion resistance of composite coating on magnesium alloy using combined microarc oxidation and inorganic sealing

引用

中国有色金属学会会刊：英文版 2012年第S3期22卷 760-763页

作者： YANG Wei wang ai-ying jiang Bai-ling Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences School of Material Science and Engineering Xi'an University of Technology

The combined microarc oxidation (MAO) and inorganic sealing process was used to deposit a composite coating to improve the corrosion resistance of AZ31 magnesium *** surface morphologies of the resulting duplex coatings were studied by ***,the corrosion resistance of the coated Mg alloy substrates was investigated using electrochemical workstation and dropping corrosion *** results show that the composite coating surface consists of Mg,Si,O and *** is difficult to deposit inorganic coating on a thick MAO coating *** the composite coating was solidified by CO2 under 175 °C,it exhibits a better corrosion resistance than the MAO monolayer,owing to the thick and compact inorganic coating.

关键词： AZ31 magnesium alloy microarc oxidation composite coating microstructure corrosion resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of Continuous Bending Process on Texture Evolution and Mechanical Properties of AZ31 Magnesium Alloy

引用

Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 225-233页

作者： Ting-Zhuang Han Guang-Sheng Huang Lun Huang bin jiang Guan-Gang wang ai-Tao Tang Fu-Sheng Pan State key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science & Technology

Mg-3Al-lZn alloy sheets have been deformed by continuous bending（CB）to investigate the effects of pro-cessing parameters（bending angle and repetitive passes）on the texture and *** samples exhibited a bimodal microstructure with abnormal growth grains in the surface region and fine grains distributed in the center after CB process followed by *** texture evolution measured by XRD indicated that the basal poles were rotated from ND toward RD,and the texture intensity decreased with the bending angle decreasing and repetitive passes *** with the as-received sample,the yield strength of CBA-120-2 sample significantly decreased from 183 to 112 MPa,and a smaller r-value and a larger n-value were *** formability of CB processed samples in annealing condition was significantly enhanced with the highest of Erichsen value of 5.4 mm,increased by about 135%.The improvement of formability was likely attributed to the weakened and RD-tilt basal texture and coarse grains in the surface part.

关键词： Magnesium alloy Continuous bending Microstructure Texture Stretch formability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：