检索结果-南通市图书馆

REDUCTION OF UNKNOWNS IN DIOPHANTINE REPRESENTATIONS

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 1992年第3期35卷 257-269页

作者：孙智伟 Department of Mathematics Nanjing University Nanjing 210008 PRC

The hardest step to solve Hilbert's tenth problem is to prove that the exponential rela-tion is Diophantine. In the study of decision problems concerning the solvability of Diophan-tine equations with few unknowns, reducing unknowns in Diophantine representations playsan important role. In this paper, we give Diophantine representations of C=φ_B(A,1) (whereφ_0(A,1) =0, φ_1(A,1) =1, φ_(m+1)(A,1) =Aφ_m(A,1)--φ_(m-1)(A,1)) and W =V~∧A_1,…,A_k∈□∧S|T∧R>0 with only 3 and 5 natural number unknowns respectively, C =φ_B(A,1) (on thecondition 1<|B|<|A|/2-1) and W =V^B∧A_1,…,A_k∈□∧S|T with 4 and 6 integer unknownsrespectively.

关键词： Hilbert’s tenth problem Diophantine representation Lucas sequence exponential relation combination of relations.

The asymptotic connection between approximation by cardinal splines and entire functions of exponential type

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1996年第4期41卷 265-270页

作者：房艮孙 Department of Mathematics Beijing Normal University Beijing 100875 China

1 Lemma and main results Entire functions of exponential type and cardinal splines are both fundamental approximating tools for the classes of functions defined on line R. On the one hand, in the 1930s, Krein, Akhieser, Berstein studied the extremal properties of entire func-tions of exponential type and obtained many outstanding results. On the other hand,

关键词： entire functions of exponential type cardinal splines asymptotic relations.

Ion Accumulation, Water relations.and Osmotic Adjustment in Atriplex argentina, A. crenatifolia, *** and A. nummularia under Saline Conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Agricultural Science and Technology(A) 2016年第5期6卷 324-334页

作者： Nadia Barcena Monica Ruiz Carlos Parera Agricultural Experimental Station-San Juan National Institute of Agricultural Technology (INTA) Integrated Unit INTA-NationalUniversity of San Juan San Juan 5400 Argentina

Salinity is a major stress that adversely affects growth and productivity in plants. There are species that tolerate this stresswithin the genus Atriplex. Four species, A. lampa, A. crenatifolia, A. nummularia and A. argentina were compared for their ionaccumulation and water relations.under saline conditions. A greenhouse study was conducted by irrigating the four species with NaCIsolutions at concentrations 0%, 1%, 2% and 4% starting when plants were six months old. Plants were harvested 45 d after startingthe salinity treatments and analyzed for their ion contents. In the four Atriplex species, Na^＋ and Cl^- contents in plants increased, whileCa^2＋ and Mg^2＋ decreased with the increase of salinity in the irrigation solution. The results suggested that A. argentina and *** were able to maintain a higher leaf relative water content （RWC） at low leaf water potential, which was associated witha greater capacity of osmotic adjustment. A. lampa showed lower ion accumulation and minor osmotic adjustment than the otherspecies. It can be concluded that the accumulation of ions favors the lower osmotic potential and contributes to osmotic adjustment inthese halophytes.

关键词： Atriplex sp., salinity stress, osmotic adjustment, ion accumulation, water relations.

The right dual of left C-rpp semigroups

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 Science Bulletin 1997年第19期42卷 1599-1603页

作者： GUO YuqiDepartment of Mathematics, Yunnan University, Kunming 650091, China Department of Mathematics Yunnan University Kunming China

SEMIGROUP S is said to be rpp (dually, lpp) if every principal right ideal aS^1(S^1a) of S, re-garded as a right (left)S^1-system, is projective. The semigroup which is both rpp and lpp is said to be abundant. These kinds of generalized regular semigroups have aroused wideattention. The Green’s,relations.(~*-Green’s relations.introduced by Pastijn) have formed avery useful tool in study on regular (abundant) semigroups. In order to develop the study onrpp semigroups a step further, we introduced the so-called (1)-Green’s,relation which

关键词： rpp semigroups left (right) C-rpp semigroups. (I)-Green’s relations.

On Generalized E-Monotonicity in Banach Spaces

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical Research and Exposition 2010年第5期30卷 903-908页

作者： Fan Long ZHANG Li Ya FAN School of Mathematics Science Liaocheng University Shandong 252059 P. R. China

Several new kinds of generalized E-preinvexity and generalized invariant E-monotonicity are introduced in the setting of Banach spaces. The relations.between E-preinvexity, E-prequasiinvexity, （pseudo, quasi） E-invexity and invariant （pseudo, quasi） E-monotonicity are studied, which can be viewed as an extension of some known results.

关键词： Eopreinvexity E-invexity invariant E-monotonicity relations.

GCI Injects New Vitality into China-Europe Exchanges

在线全文

学校读者我要写书评

暂无评论

China Today 2023年第11期72卷 26-29页

作者： LI GANG Wenzhou University Wenzhou University Oujiang College

The GCI stresses the importance of cultural exchanges,which has moved from the sideline to the center stage of international relations.

关键词： exchanges moved relations.

CPAPD International Exchanges

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

Peace 2020年第3期 44-46页

Briefings about the First Online Dialogue on China-US relations.On 14th July,the Chinese People’s Association for Peace and Disarmament,the American Friends Service Committee and the United States Institute of Peace,... 详细信息

关键词： Peace dialogue relations.

Europe’s Balancing Act

在线全文

学校读者我要写书评

暂无评论

Beijing Review 2020年第10期63卷 32-33页

作者： George N.Tzogopoulos the EU-China Program at the Centre International de Formation Européenne

When Donald Trump was elected president of the U.S.,the general sentiment in Europe was ***’s new path of unilateralism,his support for Brexit and his indifference to the European integration project raised concerns ... 详细信息

关键词： raised relations. integration

All-Weather Strategic Cooperative Partnership:My Reflections on China

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

China News Release 2023年第10期 56-58页

作者： Moin ul Haque 不详

Serving in China and particularly as an ambassador is a dream of every Pakistani diplomat.I am no exception either.I was serving as Pakistani ambassador to France when I learned about my posting to China.I was overjoyed but also humbled by the challenge and huge responsibility bestowed on me by my government to serve in a country with which we enjoy special and unique relations.

关键词： relations. China. Pakistan