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Sun G.L.,Xinjiang Agricultural University | Sun G.L.,Key Laboratory at Universities of Education | Xu M.,Xinjiang Agricultural University | Li J.,Xinjiang Agricultural University | Mei C.,Xinjiang Agricultural University
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2013

The objective of this study was to investigate the diurnal variation curves of the net photosynthetic rate (Pn) and relationship between diurnal changes of Pn and the impact factors in open center shape and delayed-open central leader system in Korla fragrant pear. Diurnal changes of Pn and effect of environmental factors (i,e. photosynthetic available radiation, temperature and relative humidity) and physiology factors (i,e. stomatal conductance, transpiration rate and intercellular CO2 concentration) on Pn in leaves of Korla fragrant pear were measured using LI-6400 portable photosynthesis system. The relationship between Pn and environmental factors were analyzed by regression analysis and correlative analysis. In order to investigate the effects of tree shape on net photosynthetic rate, we analyzed the relationship between chlorophyll content, specific leaf weight, other photosynthetic parameters and Pn between delayed-open central leader system and open center shape in this study. The results showed that the Pn under two different tree shapes indicated a bimodal curve of the asymmetry, and the midday depression of photosynthesis phenomenon appeared at 14:00. During the full fruit period, the delayed-open central leader system tree had obviously higher net photosynthetic rate than the open center shape tree in each stage. This phenomenon maight be double impacted by stomatal and non-stomatal factors. Diurnally, photosynthesis increased gradually with increasing light intensity and then decreased at noon. The peak of delayed-open central leader system tree leaves occurred at 11:00 and 15:30. The peak of open center shape tree leaves occurred at 11:00 and 17:00. The seasonal variation on Pn indicated the Pn is least in June in two shapes of Korla fragrant pear. The Pn increased with leaf chlorophyll (chl) content and specific leaf weight (SLW) increasing. There are positive relations, the correlation index of leaf chlorophyll (chl) content and Pn were 0.9438 and 0.8952 in two shapes of Korla fragrant pear. The photosynthetic pigment index of different kinds of tree shapes also had great differences. There were significant correlations between Pn and SLW in delayed-open central leader system and open center shape, but the later is higher than the former. Stomatal conductance (Gs), transpiration rate (Tr) and relative humidity (RH) increased in response to increasing Pn in all the treatments. Sample CO2 concentration (Cs) and intercellular CO2 concentration (Ci) decreased in response to decreasing Pn in all the treatments. Besides, the Cs, stomatal conductance (Gs), Tr, and Pn have reached highly significant at P≤ 0.01 in delayed-open central leader system. There were significant at P ≤0. 05 between Ci, air tempreture (Ta), photosynthetically active radiation (PAR), RH and Pn in delayed-open central leader system. However, the relativity of photosynthetic parameters and Pn were unconspicuous in the open center shape tree, The findings demonstrate that delayed- open central leader system tree had obviously higher sensitivity to the influence factors of net photosynthetic rate than the open center shape tree in this study. Source


Zhai H.,Henan Normal University | Li W.,Key Laboratory at Universities of Education | Liu Y.,Henan Normal University
Bulletin of the Korean Chemical Society | Year: 2014

We have reported the reaction probability, integral reaction cross section, and rate constant for the title system calculated with the aid of a time-dependent wave packet approach. The ab initio potential energy surface (PES) of Prudente et al. (Chem. Phys. Lett. 2009, 474, 18) is employed for the purpose. The calculations are carried out over the collision energy range of 0.05-1.4 eV for the two reaction channels of H + LiH → Li + H2 and Hb + LiHa → LiHb + Ha. The Coriolis coupling (CC) effect are taken into account. The importance of including the Coriolis coupling quantum scattering calculations are revealed by the comparison between the Coriolis coupling and the centrifugal sudden (CS) approximation calculations. Source


Jiang X.,CAS Xinjiang Technical Institute of Physics and Chemistry | Jiang X.,Key Laboratory at Universities of Education | Dong X.,CAS Xinjiang Technical Institute of Physics and Chemistry | Dong X.,Key Laboratory at Universities of Education | And 5 more authors.
Journal of Alloys and Compounds | Year: 2015

A new vanadoborate, [Ni(en)2]6[(VO)12O6B18O39(OH)3]·5H2O, has been synthesized under a hydrothermal condition. It crystallizes into rhombohedral crystal system with centrosymmetric space group of R3¯ with a = 20.824(7) Å, c = 21.050(14) Å, Z = 3. The crystal contains a novel elliptical housing with V12B18O60 clusters. Around the housing, there is six nickel atoms coordinated with two ethylenediamine molecules. The oxidation states of vanadium in the compound are V(IV) and V(V). The characterizations by powder X-ray diffraction, infrared spectroscopy, UV-Vis diffuse reflectance spectrum, and TG curve are also described. © 2014 Elsevier B.V. All rights reserved. Source


Jiang X.,CAS Xinjiang Technical Institute of Physics and Chemistry | Jiang X.,Key Laboratory at Universities of Education | Yang Y.,CAS Xinjiang Technical Institute of Physics and Chemistry | Pan S.,CAS Xinjiang Technical Institute of Physics and Chemistry | And 9 more authors.
New Journal of Chemistry | Year: 2014

A new organic-inorganic hybrid zinc borate, Zn4B3O9C2H8N2, has been prepared under hydrothermal conditions, aiming at the formation of an extended coordination polymer with Zn(ii) ions. It crystallizes into a monoclinic crystal system with a centrosymmetric space group of P21/c with a = 8.398(3) Å, b = 4.9346(18) Å, c = 14.205(4) Å, β = 95.64(2)°, and Z = 2. X-Ray diffraction analyses of available single crystals reveal novel graphene-like ZnBO layers which are connected by the disordered BO3 and ethylenediamine molecules. Formation of the corresponding zinc borate has been monitored and characterized by chemical and spectroscopic techniques. Characterization using powder X-ray diffraction, infrared spectroscopy, the UV-Vis diffuse reflectance spectrum, and the TG curve is also described. © 2014 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. Source


Li W.,Key Laboratory at Universities of Education | Zhai H.,Henan Normal University | Feng Y.,Key Laboratory at Universities of Education | Zhao J.,Key Laboratory at Universities of Education
International Journal of Quantum Chemistry | Year: 2013

In this theoretical work, we report quasiclassical dynamics predictions for the attack angle-dependence exchange processes for the H + HS (v = 0, 1; j = 0) reaction by using the new triplet 3A″ and 3A′ potential energy surfaces, respectively. The calculated quasiclassical reaction probabilities of exchange reaction channel of reaction H(D)′ + H(D)S for J = 0, 10, 20, 30, 40 are in good agreement with quantum wave packet results over the collision energy range from 0.1 to 2.0 eV on 3A″ surfaces. The attack angle dependence reaction probability of the title reactions at J = 0 are calculated, respectively, on the two surfaces. The reaction probability was found to be strongly dependent on the attack angle. It may be ascribe to the significant difference of the effective potential barrier height in the two reactions. Besides, the reaction probabilities of exchange reaction channel of reaction H(D)′ + H(D)S for J = 0, 10, 20, 30, 40 are also predicted on 3A′ surfaces. © 2013 Wiley Periodicals, Inc. Chemical reactions involving sulfur atoms and sulfur-containing species play an important role in combustion and atmospheric chemistry. Chemical stereo-dynamics can provide valuable information about relevant reactions. One stereo-dynamical effect of primary importance is the dependence of the reaction probability on the attack angle. This work analyzes barrier heights at different attack angles to obtain the influence of attack angles on the reaction probability, using new potential energy surfaces. © 2013 Wiley Periodicals, Inc. Source

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