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DFT and TD-DFT study on structure and properties of organic dye sensitizer TA-St-CA
Cai-Rong Zhang,Zi-Jiang Liu,Yu-Hong Chen,Hong-Shan Chen,You-Zhi Wu,WangJun Feng,Dao-Bin Wang 한국물리학회 2010 Current Applied Physics Vol.10 No.1
The geometry, electronic structure, polarizability and hyperpolarizability of organic dye sensitizer TA-St-CA, which contains a π-conjugated oligo-phenylenevinylene unit with an electron donor.acceptor moiety, was studied using density functional theory (DFT), and the electronic absorption spectrum was investigated via time-dependent DFT (TD-DFT) with several hybrid functionals. The calculated geometry indicates that the strong conjugated effects are formed in the dye. The TD-DFT results show that the hybrid functional PBE1PBE and MPW1PW91 are more suitable than B3LYP for calculating electronic absorption spectra. The features of electronic absorption spectra were assigned on account of the qualitative agreement between the experiment and the calculations. The absorption bands in visible and near-UV region are related to photoinduced electron transfer processes, and the diphenylaniline group is major chromophore that contributed to the sensitization, and the interfacial electron transfer are electron injection processes from the excited dyes to the semiconductor conduction band. Compared with the similar dye D5, the good performance of TA-St-CA in dye-sensitized solar cells may be resulted from the higher energy level of the lowest unoccupied molecular orbital and the larger oscillator strengths for the most excited states with intramolecular electron transfer character.
Cai, Rong-Gen,Qi, Yong-Hui,Wu, Yue-Liang,Zhang, Yun-Long American Physical Society 2017 Physical Review D Vol.95 No.12
<P>The (2 + 1)-dimensional non-Fermi liquid (NFL) has a dual description in the (3 + 1)-dimensional anti-de Sitter (AdS) spacetime. We begin with a dyonic Reissner-Nordstrom (RN) black brane background, and consider the bulk Dirac fermion field coupled with the background U(1) gauge field, as well an intrinsic axial gauge field which is induced by chiral anomaly. The axial gauge field is effectively induced from the topological term in the bulk, which would lead to nontrivial effects on the boundary NFL. We study these effects through calculating the retarded Green's functions of the dual NFL holographically, in both analytical and numerical approaches. We also obtain correlation functions in the low frequency limit at zero and finite temperatures, as well as the dispersion spectrum of the Dirac cones, Fermi arc of the surface states, which can be related with the experiment.</P>
Spin Effect and Stokes Phenomenon for Fermion Production in Electric Fields
Rong-Gen Cai,김상표,김원 한국물리학회 2019 New Physics: Sae Mulli Vol.69 No.12
One of the intriguing features of (Sauter-)Schwinger pair production is the Stokes phenomenon of no-pair production in some bipolar electric fields. The spin effect is studied on fermion pair production in the same electric fields of New Physics (Sae Mulli) 68, 1225 (2018), in which pair production of bosons is explained in terms of polons, simple poles with complex frequency. The Stokes phenomenon is showed to occur for specific parameters when the electric field is bipolar and changes the direction of antisymmetry in time. We compare the pair production of bosons and fermions and discuss its physical implications.
양영재 ( Rong Cai Yang ),양옥춘 ( Yu Chun Yang ) 한국한자한문교육학회 2012 漢字 漢文敎育 Vol.28 No.-
漢語是華廈的精神家園也是人類的共同財富, 傳播漢字是人類對世界文明的責任. 漢字的出現是前人對世界認識結果的符號化表現形式, 因此漢字的造字受前人認知規律的支配從而形成造字理據. 然而, 對于敎師來說, 漢字敎學是一個依據漢字造字理據, 重溫前人認識, 最後讓學習者直接獲取前人的認知結果從而形成創造力的過程. 當今世界的漢字敎學未能自覺地遵守漢字造字理據, 敎學方法機械, 效果欠佳, 給世界造成了“漢字難”的錯覺. 本文從中國大陸的漢字敎學現狀出發, 展現漢字敎學低效現象幷分析其原因, 提出敎學中對漢字理據的尊重. 本文著重從中國哲學觀, 政治制度, 經濟條件等方面來認識漢字造字理據的存在意義幷對漢字敎學提出見解, 爲世界範圍內的漢字敎學提出思考, 力求達到趣味, 高效的漢字敎學效果. The Chinese words have become the treasure shared by all people of the world so the teaching of them means the spreading of civilization in the world. In fact, the Chinese words represent the cognitive results from the prehistoric Chinese people. In the classrooms, the instructors will help the learners to accept the results for their originality in future by following the path of the Chinese word-formation. Unfortunately, the teachers have applied the simple and tedious methods with little attention to the philosophy of the Chinese word-formation. Form more efficient teaching, the authors introduce the existence of the philosophy of the Chinese word-formation and discusses the visualization in the words. Because the philosophy of the Chinese word-formation is an unveiled field in the Chinese researches, the paper directs the understanding from the Chinese philosophy, political system and ancient life in history. Finally, the authors suggest the three ways to the Chinese teaching guided by the philosophy of the word-formation.
중국 해상법상 송하인(托運人)의 법적 지위에 관한 검토 - FOB 매매조건을 중심으로 -
정재영(Cai-Rong Zheng),정영석(Yeong-Seok Cheng) 한국해사법학회 2005 해사법연구 Vol.17 No.2
In China, many arguments have been held upon the concept of shipper, defined in China Maritime Code (CMC). The reason is that there are two types of shippers according to the definition of a shipper, one is which contracts with a carrier referred to as "contract shipper" in this article, the other is which actually delivers the cargoes to a carrier referred to as "actual shipper" in this article; however, the other provisions about the shipper's rights and obligations cannot distinguish these two types of shippers. This matter appears in the FOB contract. The suggestion mostly proposed by many experts for amending the above-mentioned matter of shippers is that it must be indicated each provision of the shipper's rights and obligations is applied to the corresponding shipper. In this paper, we analyzed the reasonability of this suggestion and proposed our opinions. In my opinion, the person who actually delivers the cargo to a carrier has the rights to demand the carrier issuing himself the bill of lading and the other provisions for the shipper only are applied to the person who contract with the carrier. In the other words, the contract shipper should be removed from the definition of the shipper and the other remains. On the basis of the above, the rights, obligations and liabilities of the amended shippers are expounded in detail.