多体式秸秆生物质气化炉的设计

生物质能是一种清洁、可再生的能源,秸秆生物质能的开发、应用具有广阔前景,而气化燃烧是秸秆生物质能利用的一种形式。针对小型家用生物质气化炉在使用中存在气化气中焦油、灰分含量多,物料连续添加工艺复杂,而物料间断供给使用不便等问题,提出一种多体式秸秆生物质气化炉的设计。通过3个气化燃烧炉体且内炉体可拆卸,空气气化剂预热、均布供给,焦油及灰尘杂质二级净化处置等结构设计,可使得生物质物料装填工况满足家用炊事需求、保证气化反应工艺要求、有效去除气化气中焦油及灰尘杂质。多体式秸秆生物质气化炉的使用推广,可实现对秸秆生物质能源有效利用,也有助于解决秸秆生物质资源浪费及污染问题。

深海多体式浮式结构物稳性研究中浮态参数计算

介绍了深海海洋资源开发的战略意义和必要性,探讨了深海多体式浮式结构物国内外发展现状,结构型式和特点.指出常规船体与多体式浮式结构物在结构特征上的区别、浮态坐标系的选取和浮态参数的计算.提出了适合于多体式海洋浮式结构物稳性计算的浮态参数及其相互转换关系.实践证明,将该理论和以该理论为基础开发的SCMFS软件程序应用于工程实践,具有很好的适用性和通用性.

深海多体式浮式结构物浮态求解

采用参数化隐式方程组的方法建立了浮式结构物浮态方程并给出相应的求解过程,同时采用数值积分方法给出了浮式结构物与水线面求交后二维和三维封闭区域几何特性计算,最后通过实例验证了输出结果与实际数据吻合较好。实践证明,将该理论和以该理论为基础开发的软件程序应用于工程实例时,体现出了很好的适用性和通用性。

基于蓝牙通信模块的远程多体式个人辐射剂量系统的设计

目的以ATmega32A单片机为控制核心,设计一个远程多体式个人辐射剂量检测系统。方法首先,盖革管模块采集周围环境的辐射信号;其次,利用从机的ATmega32A微处理器对采集到的信号进行计算;最后,通过蓝牙模块发送到主机接收设备或手机APP,实现对辐射值数据的实时监测、远程传输以及安全报警。结果该系统与RG1100射线辐射测量仪进行同一环境的实测,两者数据最大相差0.03μSv/h,表明其可稳定实现辐射测量、监控、报警、远程连接以及多方式显示的功能。结论该系统具有便携性好、功耗低、测量准确等优点,具备一定参考价值和实用性。

Linear Factorization of λ _polynomial Over Quaternionic Field

A proof is given that any λ _polynome over real quaternionic sfield can be factorized into produce of some linear factors.By the way,some properties and applications of this factorization in matrix theory are given.

STABILITY ANALYSIS AND COOPERATIVE CONTROL OF DISTRIBUTED MULTI-AGENT SYSTEM WITH SAMPLED COMMUNICATION

The cooperative control and stability analysis problems for the multi-agent system with sampled com- munication are investigated. Distributed state feedback controllers are adopted for the cooperation of networked agents. A theorem in the form of linear matrix inequalities（LMI） is derived to analyze the system stability. An- other theorem in the form of optimization problem subject to LMI constraints is proposed to design the controller, and then the algorithm is presented. The simulation results verify the validity and the effectiveness of the pro- posed approach.

Strategies of Teaching English Poetry

This paper deals with how to teach appreciation of English poetry in college by analyzing the following items： introduction of the concept, content and writing style, the realistic meaning, multi-media aided teaching and translating English poetry into Chinese.

ENERGY EFFICIENT DISTRIBUTED STEGANOGRAPHY FOR SECURE COMMUNICATION IN WIRELESS MULTIMEDIA SENSOR NETWORKS

A secure communication mechanism is necessary in the applications of Wireless Multimedia Sensor Networks (WMSNs), which is more vulnerable to security attacks due to the presence of multimedia data. Additionally, given the limited technological resources (in term of energy, computation, bandwidth, and storage) of sensor nodes, security and privacy policies have to be combined with energy-aware algorithms and distributed processing of multimedia contents in WMSNs. To solve these problems in this paper, an energy efficient distributed steganography scheme, which combines steganography technique with the concept of distributed computing, is proposed for secure communication in WMSNs. The simulation results show that the proposed method can achieve considerable energy efficiency while assuring the communication security simultaneously.

Increased production of recombinant prourokinase with porous microcarrier cell culture by periodic pressure oscillation in a stirred tank reactor

An rCHO cell line expressing recombinant human prourokinase （pro-UK） at the level of 5μg/ 10^6cells/d was cultivated on Cytopore cellulose porous microcarriers in a 7.5L Biostat CT stirred tank reactor. A periodic pressure oscillation of 0.04 MPa and 0.04 Hz was adopted to introduce a physical stimulus on the rCHO cells and to improve mass transfer characteristic between cells and medium in the process of porous microcarrier CHO cell culture. Compared to constant pressure culture, the oscillation culture didn＇t influence specific cell growth rate significantly, but could enhance the pro-UK specific production by 10% - 40%, and reduce production of lactate by 10% - 30%. In the perfusion culture of recombinant CHO cell with serum-free medium for 67 days, cell density could reach 2.64×10^7/ml, the maximal prourokinase concentration in harvested supernatant was about 118mg/L, a total of 21.1 grams of prourokinase was produced in 313 liters of supernatant. In conclusion, the perfusion cell culture with periodic pressure oscillation can enhance the production of recombinant protein and increase the reactor specific productivity.

Effects of porous oxide layer on performance of Pd-based monolithic catalysts for 2-ethylanthraquinone hydrogenation

Pd/oxide/cordierite monolithic catalysts(oxide = Al_2O_3, SiO_2 and SiO_2\\Al_2O_3) were prepared by the impregnation method. The results of ICP, XRD, SEM–EDX, XPS and N_2 adsorption–desorption measurements revealed that the Pd penetration depth increased with increasing the thickness of oxide layer, and the catalysts with Al_2O_3 layers had the larger pore size than those with SiO_2 and SiO_2\\Al_2O_3 layers. Catalytic hydrogenation of 2-ethylanthraquinone(eA Q), a key step of the H_2O_2 production by the anthraquinone process, over the various monolithic catalysts(60 °C, atmosphere pressure) showed that the monolithic catalyst with the moderate thickness of Al_2O_3 layer(about 6 μm) exhibited the highest conversion of e AQ(99.1%) and hydrogenation efficiency(10.0 g·L^(-1)). This could be ascribed to the suitable Pd penetration depth and the larger pore size, which provides a balance between the distribution of Pd and accessibility of active sites by the reactants.

Liquid Circulation in a Multi-tube Air-lift Loop Reactor

A multi-tube air-lift loop reactor (MT-ALR) is presented in this paper. Based on the energy conservation, a mathematical model describing the liquid circulation flow rate was developed, which was determined by gas velocity, the cross areas of riser and downcomer, gas hold-up and the local frictional loss coefficient. The experimental data indicate that either increase of gas flow rate or reduction of the downcomer diameter contributes to higher liquid circulation rate. The correlation between total and the local frictional loss coefficients was also established.Effects of gas flowrate in two risers and diameter of downcomer on the liquid circulation rate were examined. The value of total frictional loss coefficient was measured as a function of the cross area of downcomer and independent of the gas flow rate. The calculated results of liquid circulation rates agreed well with the experimental data with an average relative error of 9.6%.

Polyploidy Induction of Pteroceltis tatarinowii Maxim.

[Objective] This study was conducted to obtain tetraploid Pteroceltis tatar# nowii Maxim. with excellent ornamental traits. [Method] The stem apex growing points of Pteroceltis tatarinowii Maxim. were treated with different concentrations of colchicine solution for different hours to figure out a proper method and obtain poly- ploids. [Result] The most effective induction was obtained by treatment with 0.6%- 0.8% colchicine for 72 h with 34.2% mutation rate. Flow cytometry and chromosome observation of the stem apex growing point of P. tatarinowii Maxim. proved that the tetraploid plants were successfully obtained with chromosome number 2n=4x=36. [Conclusion] The result not only fills the blank of polyploid breeding of P. tatarinowii, but also provides an effective way to broaden the methods of cultivation of fast- growing, high-quality, disease-resilience, new varieties of Pteroceltis.

Investigation fbr teaching mode of developmental biology

The reform of teaching mode, arrangement of curriculum content and investigation for relevant theory can promote the development of the biology course, and can greatly improve the research value of developmental biology. Based on this, this paper will analyze the course content, the teaching mode and the content of multimedia courseware by combining with content of developmental biology.

Study on Negative Effects of Multimedia Teaching on Education in Middle and Primary Schools

In such an information age, multimedia teaching has changed into one of the most important educational ways in middle and primary schools. In contrast to traditional education, multimedia teaching owns numerous advantages. However, there are also a great number of shortcomings in it. In this paper, considering the current situation of education in middle and primary schools, the author carries out an analysis on the negative effects of multimedia teaching on education in middle and primary schools, and also proposes some personal suggestions, hopefully providing a reference for teaching personnel in middle and primary schools.

Research on the Interactive Interpreting Teaching Mode under the Multimedia and Traditional Microteaching Environment

In this paper, we conduct research on the interactive interpreting teaching mode under the multimedia and primary traditional microteaching environment. English interpretation course system construction request from the student reality, on the basis of the actual situation, improving students＇ comprehensive ability in English interpretation as communicative teaching method in the very great degree to overall effective guide students to practice real interpreting scene comprehensively improve students＇ intercultural business negotiation, reception and comprehensive ability of the exhibition, and is advantageous to the interpretation of curriculum system construction and the improvement of the students＇ comprehensive quality. Our research integrates the general principles of the multimedia and primary traditional microteaching environment to form the better paradigm for the education that will enhance the contemporary teaching condition.

Provably Secure General Aggregate Signcryption Scheme in the Random Oracle Model

To reduce the size of certificate chains and the ciphertext size in secure routing protocols, a General Aggregate Signcryption Scheme (GASC) is presented. In GASC, an identity-based signcryption algorithm and an aggregate signature algorithm are combined in a practical and secure manner to form the general aggregate signcryption scheme's schema and concept, and a new secure, efficiently general aggregate signcryption scheme, which allows the aggregation of n distinct signcryptions by n distinct users on n distinct messages, is proposed. First, the correction of the GASC scheme is analyzed. Then, we formally prove the security of GASC in the random oracle models IND-CCA2 and EUF-CMA under the DBDHP assumption and the DLP assumption, respectively. The results show that the GASC scheme is not only secure against any probabilistic polynomial-time IND-GASC-CCA2 and EUF-GASC-CMA adversary in the random oracle models but also efficient in pairing ê computations. In addition, the GASC scheme gives an effective remedy to the key escrow problem, which is an inherent issue in IBC by splitting the private key into two parts, and reduces the communication complexity by eliminating the interaction among the senders (signers) before the signcryption generation.

Distributed multicast routing algorithm with dynamic performance in multimedia networks

The delay and DVBMT problem is known to be NP-complete. In this paper,an efficient distributed dynamic multicast routing algorithm was proposed to produce routing trees with delay and delay variation constraints. The proposed algorithm is fully distributed,and supports the dynamic reorganizing of the multicast tree in response to changes for the destination. Simulations demonstrate that our algorithm is better in terms of tree delay and routing success ratio as compared with other existing algorithms,and performs excellently in delay variation performance under lower time complexity,which ensures it to support the requirements of real-time multimedia communications more effectively.

University Organic Chemistry Education Technological innovation

the paper discusses the advantage and disadvantage of organic chemistry teaching mode of multimedia auxiliary university compared with traditional teaching mode. And combined with the author＇ s teaching practice the paper sums up that the multimedia technology shall be used as the auxiliary method of traditional teaching to optimize classroom teaching, improve the classroom efficiency and reflect the true value of the multimedia auxiliary teaching.

Application Analysis of multimedia technology in the B-learning pedagogy

With the rapid development of modern information technology, in order to meet requirements of the new situation and new technologies, today＇ s teaching model has undergone a qualitative change. New teaching model are an entirely new challenge for health professional colleges, the college teachers and students. The Once chalk teaching is replaced by multimedia teaching, which is gradually popular in the country, including schools, tertiary institutions. But in recent years we have gradually discovered the shortcomings of multimedia teaching and thereby created a new hybrid teaching model B-Learning teaching. Multimedia technology effectively combining with the B-learning teaching model, will remove multimedia technology weaknesses, and better play their strengths in teaching.

Proclus＇ Ontological Arguments concerning the Objective Existence of the Forms

In his commentary on the Platonic Parmenides, the Neoplatonist philosopher Proclus （ca. 411-485） offers a systematic defense of the objective existence of the Forms by means of the use of distinctive arguments, four of which are ontological. In contrast with Aristotle, Proclus clearly accepts that the Forms exist as principles of the world and not as posterior concepts describing the common elements of the sensible entities. Thus, he argues first that the ontological presuppositions of the sensible beings are placed in the area of the self-subsistent beings, which correspond to the categories of the Second Hypothesis of the Parmenides. The Forms belong to this area as well. In this respect, Proclus refers to the way of production of the sensible beings, aiming at a strict definition of this process. Secondly, he proves that the existence of the Forms, which possess ontological completeness, is prior to the existence of the sensible things. This is possible since the Forms are generated by the Demiurge of the whole world, by means of an internal reflection upon himself. Thirdly, in order to prove that the sensible world cannot be attributed to mere chance, he argues that the external activity, i.e., the creation of the world, depends on the internal activity, i.e., the development of the Forms in the divine intellect. Fourthly, he implements the concept of hierarchy in the realm of the Forms, through an extensive reference to the ontological priority of the imparticipable over the participable. Thus, he shows how the existence of the primary and intelligible Forms is prior to that of the substantiated Forms. Interestingly enough, the above-mentioned arguments exercised considerable influence on the commentaries of the members of the school of Ammonius, son of Hermias.