检索结果-南通市图书馆

RELATIVE CONFORMER STABILITY OF OPEN-CHAIN PHOSPHANE:A PM3 STUDY

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第3期7卷 293-296页

作者： fu jiang ding Liang fu ZHANG (Chengdu institute of organic Chemistry,Academia Sinica,Chengdu 610041) Chengdu Inst. of Organ. Chemistry Academia Sirica Chengdu 610041

The geometry and the energy of conformers of PnHn+2(n=2-9) have been studied with PM3 method. It is concluded that gauche interaction between adjacent lone electron pairs and gauche interaction between P-H bond with a... 详细信息

关键词： PM RELATIVE CONFORMER STABILITY OF OPEN-CHAIN PHOSPHANE

A THEORETICAL INVESTIGATION ON THE STRUCTURE OF THREE-DIMENSIONAL MESOGEN

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第7期7卷 665-668页

作者： fu jiang ding Liang fu ZHANG(Chengdu Institute of Organic Chemistry, Acadamia Sinica,Chengdu 61004) ACAD SINICA CHENGDU INST ORGAN CHEMCHENGDU 610041PEOPLES R CHINA

In order to investigate the relation between molecular structure and liquid crystal. properties, structural studies were carried wt on three-dimensional mesogen tetrasubstituted tribenzosilatrane using PM3 semiempirical calculations. The results show that the corresponding terminal cyano group compound (alkyl R(2) replaced by CN) has much bigger dipole moment and much better similar to sphere than alkyl compounds. Cyano compound is probably a better candidate for sphere-like mesogen.

关键词：

A NEW REACTIVITY INDEX——PSEUDO ORBITAL INDEX

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1991年第12期2卷 975-978页

作者： fu jiang ding Liang fu ZHANG Guang Nian LI Chengdu Institute of Organte Chemistry Academia SinicaChengdu 610015

The concept of pseudo orbital has been proposed, which includes the interactions of all the orbitals and extends the applicable limit of fukui's frontier orbitals. An example shows that the pseudo orbital reactivity i... 详细信息

关键词： AO A NEW REACTIVITY INDEX PSEUDO ORBITAL INDEX

THE PSEUDO ORBITAL STUDIES ON ELECTROPHILIC AROMATIC SUBSTITUTION

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1992年第1期3卷 39-42页

作者： fu jiang ding Liang fu ZHANG Guang Nian LI Chengdu Institute of Organic Chemistry,Academia Sinica,Chengdu 610015

The electrophilic aromatic substitution reactions have been studied by using the con- cept of pseudo orbital proposed by authors,Because the unoccupied orbitals of electrophilic reagents have *** into account,the pres... 详细信息

关键词： EHMO THE PSEUDO ORBITAL STUDIES ON ELECTROPHILIC AROMATIC SUBSTITUTION

The Activation and Carbonylation of the C-Cl Bond Catalyzed by Transition-Metal Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第4期9卷 345-346页

作者： Wei Zhong ZHENG Wen WAN fu jiang ding Liang fu ZHANG(Chengdu Institute of Organic Chemistry, Academia Sinica, P. O. Box 415, Chengdu 610041 Laboratory of Organomctallic Chemistry, Shanghai Institute of Organic Chemstry, Academia Sinica, Shanghai 20003 Chengdu Inst. of Organic Chemistry Academia Sinica Chengdu 610041 P. O. Box 415 China Lab. of Organometallic Chemistry Shanghai Inst. of Organic Chemistry Academia Sinica Shanghai 200032 China

Diethyl malonate was synthesized by transition-metal catalyzed alkoxycarbonylation of ethyl chloroacetate. The results show that the conversion of ethyl chloroacetate is greater than 92%, and the selectivity to diethy... 详细信息

关键词： carbonylation transition-metal complexes catalysis

Staged dendrite suppression for high safe and stable lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 674-683页

作者： Jun jiang Zhenjie Lu Yanwen ding Shujun Liu Zhijie Qi Tian Tang Yunfan Zhang Zhiyuan Ma Jingwen Sun Liang Xue Wenyao Zhang Pan Xiong Xin Wang Junwu Zhu Yongsheng fu Key Laboratory for Soft Chemistry and functional Materials of Ministry of Education Nanjing University of Science and Technology jiangsu Pylon Battery Co.Ltd

The unavoidable dendrite growth and shuttle effect have long been stranglehold challenges limiting the safety and practicality of lithium-sulfur ***,we propose a dual-action strategy to address the lithium dendrite issue in stages by constructing a multifunctional surface-negatively-charged nanodiamond layer with high ductility and robust puncture resistance on polypropylene （PP） *** uniformly loaded compact negative layer can not only significantly enhance electron transmission efficiency and promote uniform lithium deposition,but also reduce the formation of dendrite during early deposition *** importantly,under the strong puncture stress encountered during the deterioration of lithium dendrite growth under limiting current,the high ductility and robust puncture resistance（145.88 MPa） of as-obtained nanodiamond layer can effectively prevent short circuits caused by unavoidable lithium *** Li||Li symmetrical cells assembled with nanodiamond layer modified PP demonstrated a stable cycle of over 1000 h at 2 mA cm-2with a polarization voltage of only 29.3 ***,the negative charged layer serves as a physical barrier blocking lithium polysulfide ions,effectively mitigating capacity *** improved cells achieved a capacity decay of only 0.042%per cycle after 700 cycles at 3 C,demonstrating effective suppression of dendrite growth and capacity attenuation,showing promising prospect.

关键词： Ductility

Separation of the ionospheric and thermospheric contributions in the data from the Triple Ionosophere Photo Meter onboard the Feng-Yun 3E satellite

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 172-184页

作者： Fang jiang Tian MAO Jin-Song WANG Xiu-Qing HU Xiao-Xin ZHANG Liping fu Nan JIA Tianfang WANG National Space Science Center Chinese Academy of Sciences Beijing Key Laboratory of Space Environment Exploration Key Laboratory of Environmental Space Situation Awareness Technology National Satellite Meteorological Center China Meteorological Administration

The Triple Ionosphere Photo Meter （TRIPM） is a far ultraviolet nadir-view photometer that is onboard the secondgeneration,polar-orbiting Chinese meteorological satellite Feng-Yun 3E （FY-3E）,which was launched on July 5,*** has three channels,and each is used to measure different types of emissions:（1） 135.6 nm airglow produced by the recombination of the O+ions and electrons in the absence of sunlight （nighttime channel）;（2） 135.6 nm airglow from the OI when sunlight is present （daytime/dusk-dawn 135.6 nm channel）;and （3） Airglow in the N2LBH of the TRIPM （daytime/dusk-dawn N2LBH channel）.FY-3E is a satellite operating in the early morning ***,the data are mostly distributed on the dawndusk side or at times when the solar zenith angle is relatively *** this study,combined with simulation calculations,the data are *** further explore the application value of the data products,a model is used to separate the ionospheric radiative recombination contribution from the thermosphere photoelectron impact excitation contribution in the data from the daytime/dusk-dawn 135.6 nm *** approach not only improves the accuracy of O/N2derived from the 135.6 nm channel and N2LBH channel but also provides the ionospheric 135.6 nm radiance at the same time as the *** results show that the 135.6 nm radiance originating from the combination of O+and electrons extracted from the measurement data exhibits similar equatorial anomaly peak structure characteristics and seasonal variations as the corresponding GPS total electron content （TEC） *** the other hand,the separated 135.6 nm radiance generated from the thermosphere photoelectron collision excitation does not contain radiative recombination contributions;thus,the ionosphere influence is greatly avoided when the O/N2is obtained.

关键词： Far ultraviolet 135.6 nm emission intensity Photoelectron impact excitation Radiative recombination excitation

同方期刊数据库

Electrode/Electrolyte Optimization‑Induced Double‑Layered Architecture for High‑Performance Aqueous Zinc‑(Dual)Halogen Batteries

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 121-137页

作者： Chengwang Zhou Zhezheng ding Shengzhe Ying Hao jiang Yan Wang Timing Fang You Zhang Bing Sun Xiao Tang Xiaomin Liu School of Textiles and Clothing School of Chemistry and Chemical EngineeringQingdao UniversityQingdao 266071ShandongPeople’s Republic of China Centre for Clean Energy Technology School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneyUltimoNSW 2007Australia School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007HenanPeople’s Republic of China

Aqueous zinc-halogen batteries are promising candidates for large-scale energy storage due to their abundant resources,intrinsic safety,and high theoretical ***,the uncontrollable zinc dendrite growth and spontaneous shuttle effect of active species have prohibited their practical ***,a double-layered protective film based on zinc-ethylenediamine tetramethylene phosphonic acid(ZEA)artificial film and ZnF2-rich solid electrolyte interphase(SEI)layer has been successfully fabricated on the zinc metal anode via electrode/electrolyte synergistic *** ZEA-based artificial film shows strong affinity for the ZnF2-rich SEI layer,therefore effectively suppressing the SEI breakage and facilitating the construction of double-layered protective film on the zinc metal *** double-layered architecture not only modulates Zn2+flux and suppresses the zinc dendrite growth,but also blocks the direct contact between the metal anode and electrolyte,thus mitigating the corrosion from the active *** employing optimized metal anodes and electrolytes,the as-developed zinc-(dual)halogen batteries present high areal capacity and satisfactory cycling *** work provides a new avenue for developing aqueous zinc-(dual)halogen batteries.

关键词： Zn metal anodes Double-layered protective film Electrode/electrolyte optimization Aqueous zinc-(dual)halogen batteries

Positive effect of Mo on mechanical properties of a Ni-42W-10Co-x Mo medium heavy alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2025年

作者： Guo-xin Cao Jian-xin Dong Yong-sheng He He jiang Fang Hao Zhi-hua Nie Teng-fei Ma Bao-quan fu School of Materials Science and Engineering University of Science and Technology Beijing Xi'an Superalloy Technology Co. Ltd. School of Materials Science and Engineering Beijing Institute of Technology Key Laboratory of Air-driven Equipment Technology of Zhejiang Province Quzhou University

In this study,a novel Ni-W-Co-Mo medium heavy alloy (MHA) was designed to improve its mechanical strength via Mo *** the Ni-42W-10Co-xM o alloy series,where x represents the weight percent of Mo and varies between 0,1,2,5,and 10,the microstructure transitions from a dendritic structure to a hypoeutectic structure as the Mo content increases from 0 to 5wt.%.Moreover,as the Mo content increases from 0to 10wt.%,the distribution of theμ-phase shifts from being individually dispersed to forming aggregates,and its volume fraction rises from 0.5%to 7.9%.Notably,theμ-phase evolves into an eutectic microstructure,which helps in minimizing the segregation of *** change is accompanied by a substantial enhancement in mechanical properties;specifically,the compressive yield strength at room temperature increases from 350 MPa to 646 MPa,indicating a significant 85%***,the microhardness increases from 230 HV to 304 *** dynamics simulations further reveal that the strengthening mechanism of Ni-42W-10Co-xM o alloys is Mo-induced solid solution strengthening and precipitation strengthening.

关键词：