大学生创业动机的多元共生化及其产生原因研究

任何行为都需要以动机的获取为先导,在"大众创业,万众创新"的当下,要引导高校大学生参与创业活动,就首先要掌握学生真实的创业动机及其主要影响因素。只有这样,大学生成功创业的可能性才能进一步提升,创业教育的规范度才可以有所强化。为此,本研究在广泛开展问卷调查的基础上,对当前大学生创业动机存在多元共生化的现象进行阐述,并对大学生创业动机的主要影响因素展开探讨,为更好地优化高校大学生创业环境提供保障。

基督教在当代中国社会中的嬗变——对全球化背景下基督教发展趋势的考察

本文认为,当今时代,虽然“全球化”浪潮汹涌澎湃、势不可挡,经济、法律、政治的全球化方兴未艾,但“文化的全球化”将是个例外。因为“全球化”意味着“一体化”,而试图以文化的“一体化”与“单一化”取代文化的多元并存与共同发展将是不明智的,也是不可能的。在此意义上,作为西方文化的核心内容且在今天处于强势地位的基督教,在其全球范围内尤其在中国的传播过程中应该积极推进其“处境化”、“世俗化”和“共生化”的历史进程,以期达到与其他文化特别是中国文化的融会贯通、共生共荣,从而顺利地传播其福音。

论乡村旅游产品创新与旅游人力资源开发

近年来,我国乡村旅游事业呈现出良好的发展势头和更加美好的前景,但在其发展过程中也出现了许多困难与问题。为此,一方面在开发乡村旅游新产品的时候需要因地制宜、因人制宜,另一方面,也应正确处理发展乡村旅游与保护农村生态环境和人文传统的关系,坚持经营者共生化,加强对乡村旅游人力资源的培训。

华山景区手工艺品行业发展分析

华山是我国开发较早的国家级5A级景区。但景区存在产品缺乏特色,资源浪费严重,管理混乱等问题。以华山手工艺品行业为例,结合调查结果,提出应突出行业特色,促进产业链本土化;挖掘当地民俗,建设特色行业圈;注重外来文化的吸收利用,实现行业内的分工、合作共生;利用景点的集群效应,扩大客源市场;发展特色工艺,提高知名度,通过整合实现全行业的健康快速发展。

微时代背景下的微建筑发展趋势

"微时代"中的"微"是社会变革的一个语义表征,是社会技术变革的象征,技术的发展势必对各个行业领域产生巨大的影响。本文首先对微建筑的概念进行了界定,进而总结了微建筑的三个主要特征,即建筑形态微小简洁、建筑空间复合可变和建筑材料轻质高强;作者梳理了微建筑目前的发展状况,结合微时代背景下的社会技术变革,总结出微建筑产品化、智能化和共生化的发展趋势。

Solidification process and microstructure evolution of bulk undercooled Co-Sn alloys

A series of Co-Sn alloys with Sn content ranging from 12% to 32%（mole fraction） were undercooled to different degrees below the equilibrium liquidus temperature and the solidification behaviors were investigated by monitoring the temperature recalescence and examing the solidification microstructures.A boundary clearly exists,which separates the coupled growth zone from the decoupled growth zone of eutectic phases for the alloys with Sn content ranging from 14% to 31%（mole fraction）.The other Co-Sn alloys out of this content range are hard to be undercooled into the coupled growth zone in the experiment.It is found that the so-called non-reciprocal nucleation phenomenon does not happen in the solidification of undercooled Co-Sn off-eutectic alloys.

A Theoretical Analysis of Interactive Coercing Effects Between Urbanization and Eco-environment

Objectively, a complex interactive coercing relationship exists between urbanization and eco-environment, and the research of this relationship is primarily divided into three schools, i.e., interactive coercion theory, interactive promotion theory and coupling symbiosis theory. Harmonizing the relationship between urbanization and eco-environment is not only an important proposition for the national development plan but also the only way to promote healthy urbanization. Based on an analysis of urbanization process and its relationship with the eco-environment, this article analyzes interactive coercing effects between urbanization and eco-environment from three perspectives of population urbanization, economic urbanization and spatial urbanization, respectively, and analyzes risk effects of the interactive coercion. Further, it shows six basic laws followed by interactive coercion between urbanization and eco-environment, namely, coupling fission law, dynamic hierarchy law, stochastic fluctuation law, non-linear synergetic law, threshold value law and forewarning law, and divides the interactive coercing process into five stages, namely, low-level coordinate, antagonistic, break-in, ameliorative and high-grade coordinate. Based on the geometric derivation, the interactive coercing relationship between urbanization and eco-environment is judged to be non-linear and it can be explained by a double-exponential function formed by the combination of power and exponential functions. Then, the evolutionary types of the interactive coercing relationship are divided into nine ones: rudimentary coordinating, ecology-dominated, synchronal coordinating, urbanization lagging, stepwise break-in, exorbitant urbanization, fragile ecology, rudimentary break-in and unsustainable types. Finally, based on an interactive coercion model, the degree of interactive coercion can be examined, and then, an evolutionary cycle can be divided into four phases, namely rudimentary symbiosis, harmonious development, utmost increasing and spiral type rising. The study results offer a scientific decision-making of healthy urbanization for achieving the goal of eco-environment protection and promoting urbanization.

Nerve growth factor involvement in liver cirrhosis and hepatocellular carcinoma

AIM: To define NGF (nerve growth factor) and its high- affinity receptor trkANGF presence and distribution in fibrotic liver and in HCC, and to verify if NGF might have a role in fibrosis and HCC. METHODS: Intracellular distribution of NGF and trkANGF were assessed by immunohistochemistry and immuno- electron microscopy in liver specimens from HCC, cirrhosis or both. ELISA was used to measure circulating NGF levels. RESULTS: NGF and trkANGF were highly expressed in HCC tissue, mainly localized in hepatocytes, endothelial and some Kupffer cells. In the cirrhotic part of the liver they were also markedly expressed in bile ducts epithelial and spindle-shaped cells. Surprisingly, in cirrhotic tissue from patients without HCC, both NGF and trkANGF were negative. NGF serum levels in cirrhotic and/or HCC patient were up to 25-fold higher than in controls. CONCLUSION: NGF was only detected in liver tissue with HCC present. Intracellular distribution suggests paracrine and autocrine mechanisms of action. Better definition of mechanisms may allow for therapeutic and diagnostic/prognostic use of NGF.

Dihydrochalcones and phenanthrene derivatives from Fissistigma bracteolatum

Three dihydrochalcones derivatives 1-3, flavone 4 and phenanthrene derivative 5 were isolated, together with 9 known compofinds, from the air-dried root bark of Fissistigma bracteolatum Chatterjee. Their structures were determined by spectroscopic （NMR, MS） and chemical methodologies.

Construction of a Metagenomic DNA Library of Sponge Symbionts and Screening of Antibacterial Metabolites

To study the bioactive metabolites produced by sponge-derived uncultured symbionts, a metagenomic DNA library of the symbionts of sponge Gelliodes gracilis was constructed. The average size of DNA inserts in the library was 20 kb. This library was screened for antibiotic activity using paper disc assaying. Two clones displayed the antibacterial activity against Micrococcus tetragenus. The metabolites of these two clones were analyzed through HPLC. The result showed that their metabolites were quite different from those of the host E. coli DNA and the host containing vector pHZ132. This study may present a new approach to exploring bioactive metabolites of sponge symbionts.

Improving Simulation of the Terrestrial Carbon Cycle of China in Version 4.5 of the Community Land Model Using a Revised V_(cmax) Scheme

The maximum rate of carboxylation （Vcax） is a key photosynthetic parameter for gross primary produc- tion （GPP） estimation in terrestrial biosphere models. A set of observation-based Vcax values, which take the ni- trogen limitation on photosynthetic rates into consideration, are used in version 4.5 of the Community Land Model （CLM4.5）. However, CLM4.5 with carbon-nitrogen （CN） biogeochemistry （CLM4.5-CN） still uses an inde- pendent decay coefficient for nitrogen after the photosyn- thesis calculation. This means that the nitrogen limitation on the carbon cycle is accounted for twice when CN bio- geochemistry is active. Therefore, to avoid this double nitrogen down-regulation in CLM4.5-CN, the original Vcmax scheme is revised with a new one that only accounts for the transition between Vcmax and its potential value （without nitrogen limitation）. Compared to flux tower- based observations, the new Vcmax scheme reduces the root-mean-square error （RMSE） in GPP for China's Mainland by 13.7 g C m-2 yr-1, with a larger decrease over humid areas （39.2 g C m 2 yr-1）. Moreover, net primary production and leaf area index are also improved, with reductions in RMSE by 0.8% and 11.5%, respectively.

Stepwise recovery of magnesium from low-grade ludwigite ore based on innovative and clean technological route

A novel and clean technological route for the comprehensive utilization of low-grade ludwigite ore was proposed, inwhich magnesium was extracted by metallizing reduction？magnetic separation, sulfuric acid leaching and ethanol precipitationoperation. Meanwhile, iron-rich product, silicon-rich product and boron-rich product were obtained, respectively. In the process ofmetallizing reduction-magnetic separation, 94.6% of magnesium was enriched in the non-magnetic substance from the ore reducedat 1250 ℃ for 60 min with the ore size of 0.50-2.00 mm and coal size of 0.50-1.50 mm. When the non-magnetic substance wasleached at 90 ℃ for 15 min with the liquid-to-solid ratio of 7：1, 87.4% of magnesium was leached into the liquor separated fromsilicon gathering in leaching residue. The ethanol precipitation was conducted for 30 min with the ethanol-to-original liquid volumeratio of 1.5：1 at room temperature. 97.2% of magnesium was precipitated out with the initial concentration of 0.8 mol/L in the formof MgSO4·7H2O.

A Macaca mulatta model of fulminant hepatic failure

AIM:To establish an appropriate primate model of fulminant hepatic failure (FHF).METHODS:We have,for the first time,established a large animal model of FHF in Macaca mulatta by intraperitoneal infusion of amatoxin and endotoxin.Clinical features,biochemical indexes,histopathology and iconography were examined to dynamically investigate the progress and outcome of the animal model.RESULTS:Our results showed that the enzymes and serum bilirubin were markedly increased and the enzyme-bilirubin segregation emerged 36 h after toxin administration.Coagulation activity was significantly decreased.Gradually deteriorated parenchymal abnormality was detected by magnetic resonance imaging (MRI) and ultrasonography at 48 h.The liver biopsy showed marked hepatocyte steatosis and massive parenchymal necrosis at 36 h and 49 h,respectively.The autopsy showed typical yellow atrophy of the liver.Hepatic encephalopathy of the models was also confirmed by hepatic coma,MRI and pathological changes of cerebral edema.The lethal effects of the extrahepatic organ dysfunction were ruled out by their biochemical indices,imaging and histopathology.CONCLUSION:We have established an appropriate large primate model of FHF,which is closely similar to clinic cases,and can be used for investigation of the mechanism of FHF and for evaluation of potential medical therapies.

Study on Optimal Strategy of Grade Transition in Industrial Fluidized Bed Gas-Phase Polyethylene Production Process

A model of grade transition is presented for a commercialized fluidized bed gas-phase polyethylene production process. The quantity of off-specification product and the time of grade transition can be minimized by the optimization of operating variables, such as polymerization temperature, the ratio of hydrogen to ethylene, the ratio of co-monomer to ethylene, feed rate of catalyst, and bed level. A new performance index, the ratio of melt flow (MFR), is included in the objective function, for restraining the sharp adjustment of operation variables and narrowing the distribution of molecular weight of the resin. It is recommended that catalyst feed rate and bed level are decreased in order to reduce the grade transition time and the quantity of off-specification product. This optimization problem is solved by an algorithm of sequential quadratic programming (SQP) in MATLAB. There is considerable difference between the forward transition and reverse transition of grade with regard to the operating variables due to the non-linearity of the system. The grade transition model is extended to a high space time yield (STY) process with the so-called condensed model operation. In the end, an optimization strategy for multi-product transition is proposed with two-level optimization of the objective function J(x,u) on the basis of the optimal grade transition model. A sequential transition of six commercial polyethylene grades is illustrated for an optimal multi-product operation.

A Mathematical Model for Simultaneous Saccharification and Co-fermentation （SSCF） of C6 and C5 Sugars

Reliable production of biofuels and specifically bioethanol has attracted a significant amount of re-search recently.Within this context,this study deals with dynamic simulation of bioethanol production processes and in particular aims at developing a mathematical model for describing simultaneous saccharification and co-fermentation （SSCF） of C6 and C5 sugars.The model is constructed by combining existing mathematical mod-els for enzymatic hydrolysis and co-fermentation.An inhibition of ethanol on cellulose conversion is introduced in order to increase the reliability.The mathematical model for the SSCF is verified by comparing the model predic-tions with experimental data obtained from the ethanol production based on kraft paper mill sludge.When fitting the model to the data,only the yield coefficients for glucose and xylose metabolism were fine-tuned,which were found to be 0.43 g·g-1 （ethanol/glucose） and 0.35 g·g-1 （ethanol/xylose） respectively.These promising validation results encourage further model application to evaluate different process configurations for lignocellulosic bioetha-nol technology.

Microwave-Assisted Decarboxylation of Sodium Oleate and Renewable Hydrocarbon Fuel Production

The carboxyl terminal of sodium oleate has a stronger polarity than that of oleic acid;this terminal is more likely to be dipole polarized and ionically conductive in a microwave field.Sodium oleate was used as the model compound to study the decarboxylation of oleic acid leading to hydrocarbon formation via microwave-assisted pyrolysis technology.The pyrolysis gas,liquid,and solid products were precisely analyzed to deduce the mechanism for decarboxylation of sodium oleate.Microwave energy was able to selectively heat the carboxyl terminal of sodium oleate.During decarboxylation,the double bond in the long hydrocarbon chain formed a p-πconjugated system with the carbanion intermediate.The resulting p-πconjugated system was more stable and beneficial to the pyrolysis reaction(decarboxylation,terminal allylation,isomerization,and aromatization).The physical properties of pyrolysis liquid were generally similar to those of diesel fuel,thereby demonstrating the possible use of microwaves for controlling the decarboxylation of sodium oleate in order to manufacture renewable hydrocarbon fuels.

High-rate removal of As(Ⅲ) from aqueous system with sulfhydryl magnetic biological bamboo charcoal nanocomposites prepared by chemical co-precipitation method

Sulfhydryl magnetic biological bamboo charcoal nanocomposite(BBC@nFe-SH)was prepared by chemical co-precipitation method for the robust capture of As(Ⅲ)from aqueous solutions.The novel BBC@nFe-SH shows favorable magnetic field strength(83376 A/m),which enables BBC@nFe-SH to be quickly recovered from aqueous solution.The maximum As(Ⅲ)adsorption capacity is as high as 98.63 mg/g at pH 5.0 and 40°C,reaching reaction equilibrium within 120 min.Various characterizations(e.g.,SEM,FTIR,VSM and XPS)suggest that As(Ⅲ)prefers to coordinate with surface oxygen groups bonded to the surface.BBC@nFe-SH displayed high stability and recyclability throughout the removal process,which could be easily activated by 1 mol/L NaOH after usage.Thus,the novel BBC@nFe-SH has promising applications for As(Ⅲ)treatment.

From a Vernacular Photograph to an Icon： The Spirited Face of Gezi Park Resistance

During spring 2013, an important uprising had broken out and marked a historic period for political activism in Turkish memory. Focusing on the afterlives of photographic portraits produced during this “Occupy Gezi Movement”, the paper considers iconized digital portraitures as a peculiar genre of vernacular photography and focuses on its visual language, and cultural codes as a part of the underground resisting culture in daily life. It explores different contexts in which photographic portraits have been used as a tool of protest and their various kinds of remediation from the Gezi Park Protest onwards. Private portraits as an agent of resistance have been creatively modified, recreated, rematerialized and circulated in distinct ways during and after the protest： from city walls as stencils, stickers, and graffiti （in actual public spaces） to Facebook profile walls as online digital re-mastering （virtual spheres）. This article concentrates on aesthetics of such iconized digital photographic portraitures in contemporary Turkey. It particularly focuses on one of the instances that have labeled the Occupy Gezi Movement： the death of Berkin Elvan, who turned 15 while in a coma who has been struck in the head by a tear gas canister, fired by police, while on his way to buy bread. This case has been a catalyst for further demonstrations against Turkey＇s ruling party and turned Elvan＇s high-spirited face and dark eyebrows, to one of the strong symbols of the resistance. The teenage boy＇s injury during the protests, his birthday while he was in a coma at the hospital, his death, funeral and commemorations have been stress points in which his photographic portrait have been modified and redesigned according to the occasion and circulated widely. The image of the youth symbol of the struggle and the different kinds of cultural work his photograph have performed is the main focus of this research. The digital social afterlives of Elvan＇s iconized imagery as illustrations and drawings; as stencils and graffiti at streets; as posters and framed photographs in political performances carried around in public spaces and commemorative acts; and as digital data circulated in social media both consisting of indexical and iconic dements regarding their photographic features. This transformation of the single analog vernacular photograph of Elvan to various digital versions and continuous re-interpretation and re-materialization is discussed depending on the local history of the occasion and the critical literature on photographic history and theories of photographic vernacularity. This research makes use of data collecting methods that netnographic research methodology uses. The paper focuses on the ways local vernacularity is historically produced and evolved in this particular time of Gezi Park Resistance.

Isolation and Identification of Nicotiflorin and Narcissin from the Aerial Parts of Peucedanum aucheri Boiss.

Peucedanum aucheri Boiss. （Apiaceae） is a herbaceous wild plant native to Iran and is used in Iranian folk medicine as a diuretic and for the treatment of kidney disorders. Phytochemical investigation of different extracts prepared from the aerial part of P. aucheri Boiss. resulted to the isolation of two main flavonol glycosides from methanolic extract. Using comprehensive spectroscopic methods, including 1D and 2D nuclear magnetic resonance （NMR） spectroscopy and mass spectroscopy, chemical structure of isolated compounds were determined as kaempfrol-3-o-rutinoside （nicotiflorin） and isorhamnetin-3-o-rutinoside （narcissin）. Although narcissin has previously been isolated from P. ruthenicum, to the best of our knowledge, isolation of nicotiflorin from Peucedanum genus is reported for the first time.

To resolve recent natural immune defense effects of antimicrobial peptides in the gastrointestinal tract

The human gut is the normal habitat of a lot of microorganisms; in the long process of evolution they have developed a symbiotic relationship with the host. Under normal circumstances they do not damage the health, which totally owes to the barrier functions of the integral intestinal mucosa. Intestinal lnucosal barriers are mainly composed of four parts： mechanical barrier, immune barrier, chemical and biological barrier. Each of these functions has corresponding structural basis, an important barrier to prevent harmful substances and pathogens in the gut into the inner environment of the body, and to maintain a stable internal environment.