二维配位聚合物[Tb(1,4⁃bdc)_(1.5)(phen)(H_(2)O)]_(n)的合成、晶体结构及对Fe_(3+)离子的荧光检测

通过溶剂热反应成功合成出一种新型2D配位聚合物[Tb(1,4-bdc)_(1.5)(phen)(H_(2)O)]_(n)(1)(1,4-H_(2)bdc=对苯二甲酸;phen=菲咯啉)。对其进行了单晶X射线衍射、粉末X射线衍射、红外光谱、元素分析、荧光光谱表征。X射线衍射晶体学分析表明,配合物1结晶于三斜晶系P1空间群,2个相邻的Tb(Ⅲ)离子与4个1,4-bdc^(2-)通过—O—C—O—桥联成双核单元,并进一步通过1,4-bdc^(2-)桥联成二维层状结构。荧光实验证明配合物1可以通过荧光猝灭机制检测Fe_(3+),Ksv=8.39×10^(3) L·mol-1,检测限为0.017μmol·L^(-1)。

碳纳米管改性高密度聚乙烯的研究进展

高密度聚乙烯(HDPE)因具有加工成型容易和化学稳定性高的优点,在各个领域得到广泛应用,但是高密度聚乙烯存在容易产生和积累静电、拉伸强度低、热导率和电导率低等问题限制了其在某些领域的应用。而碳纳米管/高密度聚乙烯材料具有独特的一维纳米管分散微结构,其电学性能、热学性能和力学性能等优于HDPE,应用前景广阔,因此,通过改性碳纳米管可以开发新型的碳纳米管/高密度聚乙烯复合材料。分析了碳纳米管的改性和碳纳米管改性高密度聚乙烯复合材料的最新研究进展,展望了碳纳米管改性高密度聚乙烯复合材料的研究方向。

Farmers’ Access to Agricultural Information Sources: Evidences from Rural Pakistan

The current study was conducted to probe farmers’ accessible agricultural information sources in rural areas of Pakistan. For this purpose a random sample of 160 households from four districts of the Punjab province of Pakistan was selected. Data were collected using validated and expert reviewed questionnaire with the help of interview method. The results revealed that majority of farmers (47.5%) ranked neighbor-friends-relatives as first source of information while 31.9% of farmers ranked this source as second and 33.7% farmers’ ranked it as third major source. With contrast to this very less farmers (10%) ranked agricultural extension staff as first information source. Keeping in view the study results, the performance of extension staff is not encouraging;therefore government should plan and launch a policy to foster performance of public agricultural extension system to fulfill the advanced technological needs of farmers to flourish sustainable agriculture and rural development.

BIIR的制备与结构性能表征

以IIR、溴化氢和双氧水为原料,以氯仿为溶剂,采用正交试验设计法制备BIIR,研究反应温度、时间、引发剂和胶液浓度对BIIR溴含量的影响,并对其硫化性能进行研究。结果表明,最佳反应条件为:反应温度50℃,时间5min,胶液质量分数0.15。与IIR相比,BIIR不饱和度降低,相对分子质量提高约20%,且相对分子质量分布变宽,硫化速率提高约30%。

Foliar application of micronutrients enhances crop stand, yield and the biofortification essential for human health of different wheat cultivars

Globally about half of the world’s population is under micronutrient malnutrition due to poor quality food intake.To overcome this problem,fortification and biofortification techniques are often used.Biofortification is considered a better option than fortification due to the easy control of nutrient deficiencies present in daily food.This field experiment was conducted to evaluate the effects of foliar application of a micronutrient mixture(MNM)consisting of zinc(Zn),iron(Fe),copper(Cu),manganese(Mn)and boron(B)on yield and flour quality of wheat.The results show the effectiveness of foliar feeding for growth and yield parameters,in addition to the enriching of wheat grains with Zn,Cu,Fe,Mn and B.Compared to the control without foliar feeding,foliar application on wheat crop increased tillering ability,spike length,grain yield and the contents of Zn,Cu,Mn,Fe and B by 21,47,22,22 and 25%in wheat flour,respectively.Therefore,foliar feeding of micronutrients could be an effective approach to enrich wheat grains with essential nutrients for correcting malnutrition.

Simultaneous operation of dibenzothiophene hydrodesulfurization and methanol reforming reactions over Pd promoted alumina based catalysts

In the current study simultaneous reactions of hydrodesulfurization(HDS) of dibenzothiophene(DBT) and reforming of methanol in a micro-autoclave reactor were studied over bi-metallic(Co-Mo/Al2O3 and Ni-Mo/Al2O3) and tri-metallic(Pd-Co-Mo/Al2O3 and Pd-Ni-Mo/Al2O3) catalyst systems which were prepared by incipient impregnation method.In situ hydrogen utilization and low Pd loadings were the major targets of this study.For comparison purpose,catalytic activity was separately determined for both the methanol reforming and HDS of DBT reactions as well.Ni based catalysts were confirmed with better activity than Co ones for both the reactions with Pd promoted ones ranking at the top i.e.Pd-Ni-Mo/Al2O3 > Ni-Mo/Al2O3 > Pd-Co-Mo/Al2O3 > Co-Mo/Al2O3 where Pd-Ni-Mo/Al2O3 showed 91% DBT conversion at 380 ℃ and 12 h reaction time.Some of the selected organic additives on catalytic activity were tested for their effect toward HDS reaction which was unique with close relation to their chemical nature.Reaction products were quantitatively and qualitatively analyzed via HPLC and GC-MS techniques respectively which helped in elucidating reaction mechanism.

An efficient cubic trigonometric B-spline collocation scheme for the time-fractional telegraph equation

In this paper,a proficient numerical technique for the time-fractional telegraph equation(TFTE)is proposed.The chief aim of this paper is to utilize a relatively new type of B-spline called the cubic trigonometric B-spline for the proposed scheme.This technique is based on finite difference formulation for the Caputo time-fractional derivative and cubic trigonometric B-splines based technique for the derivatives in space.A stability analysis of the scheme is presented to confirm that the errors do not amplify.A convergence analysis is also presented.Computational experiments are carried out in addition to verify the theoretical analysis.Numerical results are contrasted with a few present techniques and it is concluded that the presented scheme is progressively right and more compelling.

Enhanced Pervaporative Separation of Thiophene/n-Heptane Using Metal Loaded PEBAX/PAN Membranes

The mass transfer of thiophene through pervaporation（PV） membranes could be facilitated by certain transitional metal ions like Ag+, Mn2+, and Cr3+ thanks to their p complexation with thiophene. In this study, Ag+, Mn2+, and Cr3+ ions were loaded onto the polyether block amide（PEBAX）/PAN composite membranes and were tested on the performance for separation of thiophene/n-heptane mixture. Pervaporation test results showed that the pervaporative separation index increased significantly to 73.1%, 75.5%, and 97.2% at 30 oC for the Ag+-, Mn2+-, Cr3+-loaded PEBAX membranes, respectively,as compared to the pristine PEBAX/PAN composite membrane.

Possibility of Socio-economic Attributes and ICT Application in Improving Quality of Farmers

Evaluation on the diversified Information and Communication Technologies( ICTs) application along their association in socio-economic attributes can provide valuable insights about the trends of farmers towards improvement.Therefore,analytical research design and descriptive statistics were used to analyze the data collected from 400 respondents within different regions of Punjab Province in Pakistan.Based on the findings,it is recommended that government in collaboration with all stakeholders should launch regular,holistic and modern ICTs programs like applications of robo calls,SMS,etc.services at central level to ensure timely availability of agricultural information to improving the quality of young farmers.Furthermore,it is recommended to launch effective monitoring and evaluation mechanism of ICTs for agricultural development.

The Impact of Poverty Alleviation Policy on Urban Household Demand

Many policies and measures for poverty alleviation have been undertaken by the Chinese government, but few researchers have explored its experience and lessons. This research focuses on household needs like food, clothing, housing, household equipment and supplies, transportation and communication, education and entertainment, healthcare;and also focuses on food items such as grains, meat, eggs, milk, vegetables, fruits and others in urban China. In poor households, the average disposable income per capita is less than or near per capita expenditure;and the Engels coefficient is often over 40%. The data from 1997-2012 in this research is in the provincial level from the Information Website of Development Research Center of the State Council (or “DRCnet”). The authors used the two stage ELES-AIDS (Almost Ideal Demand System) to estimate the price elasticity and expenditure elasticity of the household’s expenditures. According to the results, it is recommended that the government should follow economic law and improves policy efficiency, especially its food policy to alleviate the poverty of low income residents.

Crystal Structure,Fe^(3+) Luminescence Sensing and Color Tuning of 2D Lanthanide-metal-organic Frameworks Constructed from Tricarboxylic Acid Ligand

A new lanthanide metal-organic framework (MOF)[Eu(BTB)(phen)(DMF)]·DMF (1,DMF=N,N-dimethylformamide) was synthesized using H_(3)BTB (1,3,5-tri(4-carboxyphenyl)benzene) and phen(1,10-phenanthroline) under solvothermal conditions.The structure of the prepared MOF was characterized by single-crystal X-ray diffraction analyses,elemental analysis,fluorescence spectrum,FT-IR spectroscopy,powder X-ray diffraction and thermogravimetric analyses.The structure of 1 can be viewed as a 3-D supramolecular network,which is formed by the stacking of 2D layers throughπ-πinteraction.The luminescence explorations revealed that 1 possesses favorable selectivity and sensitivity for testing Fe^(3+).Additionally,color tuning was achieved by varying Eu^(3+):Tb^(3+)ratios in the reaction mixtures.

Synthesis,Crystal Structure and Fluorescent Properties of a 1D Europium Coordination Polymer with 2,5-Furandicarboxylic Acid

By using solvothermal method,a one-dimensional chain compound[KEu_(2)(FDCA)_(3)(H_(2)O)_(9)·0.5(FDCA)](1)was synthesized.Single-crystal X-ray diffraction data reveal that 1 crystallizes in monoclinic system,space group P21/n with a=12.1996(1),b=18.6454(2),c=17.7123(2)Å,β=98.8460(10)°,Dc=1.753 g/cm3,Z=2,V=3981.03(7)Å3,R=0.0544 and wR=0.1511 for 7886 observed reflections with I>2σ(I).In 1,three FDCA2–ligands construct a“23-crown-9-like”structure as the second building units(SBUs)to further form an infinite 1D chain.Meanwhile,the fluorescent result reveals that compound 1 can selectively and sensitively sense Fe^(3+)by the fluorescence quenching.

1,4-丁二醇生产工艺及其换热网络优化

针对混合C_(5)原料联产顺酐和苯酐的1,4-丁二醇生产工艺存在能耗高的缺陷,通过对生产工艺的模拟,并采用夹点技术,分析和优化了1,4-丁二醇生产工艺的能耗,并进一步对换热网络进行集成和优化,达到了节能效果。研究结果表明:节省热公用工程10239.3 kW和冷公用工程21683.2 kW,换热单元数由原来44个减少为32个,降低了设备成本。