Zhejiang University of Media and Communications

Hangzhou, China
Time filter
Source Type

News Article | May 23, 2017
Site: en.prnasia.com

LISHUI, China, May 24, 2017 /PRNewswire/ -- Tantech Holdings Ltd. (NASDAQ: TANH), ("Tantech" or the "Company"), a leading alternative energy company through the use of bamboo-based charcoal products, along with the media center of Zhejiang Provincial Public Security Department and the Transport Police of Hangzhou Municipal Public Security Bureau, held an award ceremony for the 2017 design contest to promote traffic etiquette at Qinghua Hotel, Hangzhou. The contest, participated by Hangzhou university and college students, was aimed at encouraging road civility and reducing traffic disturbance. Mrs. Zhang Yefang, managing director of Tantech, was invited to attend the ceremony and presented the trophies to the award winners. With the theme of "Order, Life and Future," the contest advocated the new traffic idea of "Self-disciplined, Love, Comity and Civilization," and was focused on hot issues ranging from Internet-based bicycle sharing to various illegal acts against traffic laws. The awards were given in the five sectors--online popularity, public service propaganda, digital media, graphic design and organization, and 17 pieces of works produced by students from China Academy of Art, Zhejiang Police College, Zhejiang SCI-Tech University, Zhejiang Gongshang University and Zhejiang University of Media and Communications received the awards. Zhejiang Provincial Public Security Department has since March 1 launched a campaign to promote road etiquette through year end. As one of the advocates for road etiquette, Tantech has responded warmly. The company has strengthened guidance for civilized traffic and corrected bad manners among its employees and their friends, and worked closely with the organizer to promote road etiquette. Tantech's logo, along with the campaign for civilized traffic, has entered colleges and universities, becoming a splendid landscape. Established in 2001 and headquartered in Lishui City, Zhejiang Province, China, Tantech Holdings Ltd., together with its subsidiaries, develops and manufactures bamboo-based charcoal products in China and internationally. It operates through three segments: Consumer Products, Trading, and Biofuel Energy. The company produces pressed and formed charcoal briquettes for use in grills, incense burners, and other applications under the Algold brand. It also offers Charcoal Doctor branded products, such as air purifiers and humidifiers, automotive accessories for air purification, underfloor humidity control, pillows and mattresses, wardrobe deodorizers, mouse pads and wrist mats, refrigerator deodorants, charcoal toilet cleaner disks, liquid charcoal cleaners, shoe insoles, and decorative charcoal gifts. In addition, the Company provides liquid byproduct consists of bamboo vinegar that is used in disinfectants, detergents, lotions, specialized soaps, toilet cleaners, and fertilizers, as well as in various agricultural applications. Further, it engages in providing bamboo carbon for use in EDLCs; the production of electric double-layer capacitor carbon products; and the industrial purchase and sale of rubber. The Company provides its products for industrial energy applications, as well as household cooking, heating, purification, agricultural, and cleaning uses. The company also exports its bamboo vinegar, bamboo charcoal purification, and EDLC carbon products. For more information about Tantech Holdings Ltd., please visit: http://www.tantech.cn/en/index.asp. This news release contains forward-looking statements as defined by the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements that are other than statements of historical facts. These statements are subject to uncertainties and risks including, but not limited to, product and service demand and acceptance, changes in technology, economic conditions, the impact of competition and pricing, government regulations, and other risks contained in reports filed by the company with the Securities and Exchange Commission. All such forward-looking statements, whether written or oral, and whether made by or on behalf of the Company, are expressly qualified by this cautionary statement and any other cautionary statements which may accompany the forward-looking statements. In addition, the Company disclaims any obligation to update any forward-looking statements to reflect events or circumstances after the date hereof. For more information please contact: To view the original version on PR Newswire, visit:http://www.prnewswire.com/news-releases/tantech-advocates-traffic-etiquette-and-supports-student-public-services-300462229.html

Zhao Z.,Zhejiang University of Media and Communications
International Journal of Online Engineering | Year: 2017

For real-world wireless sensor networks (WSNs), the invulnerability of the network is very critical, because a cascading failure would cause a serious effect on the whole network performance. Network survivability is closely dependent on the topology structure of a network. In this paper, [Note: If you use "firstly," you need to add "secondly," "thirdly,"... "finally" throughout this paragraph; I don't see a need for this here] we meticulously study the topology characteristics of WSNs based on the complex network theory. According to scale-free and small-world features of complex networks, the nodes of WSNs are divided into different types, including common node, super node, and sink node. From the point of view of invulnerability in complex networks, the influence of different types of nodes on the sensor networks' invulnerability is analyzed. Simulation experiments show that adding super nodes to the WSNs would significantly improve network survivability.

Dai C.-Q.,Zhejiang Agriculture And forestry University | Zhang J.-F.,Zhejiang University of Media and Communications
Nonlinear Dynamics | Year: 2013

Inspired by the mapping method and the direct method of symmetry reduction method, we present a new algorithm, nonlinear Schrödinger equation-based constructive method, to solve complex nonlinear evolution equations. This method can easily construct infinite solutions of the complex nonlinear evolution equations from abundant solutions of the nonlinear Schrödinger equation, including multi-soliton solutions with and without continuous wave background, rational solutions and periodic solutions, and so on. With the aid of symbolic computation, we choose (2+1)-dimensional and (3+1)-dimensional variable-coefficient nonlinear Schrödinger equations to illustrate the validity and advantages of the proposed method. According to exact solutions, we also graphically discuss some interesting soliton-like wave dynamic behaviors, which may be observable in the future experiments. These results are helpful to increase the bit-rate of optical communication. © 2013 Springer Science+Business Media Dordrecht.

We study two kinds of the generalized (3+1)-dimensional cubic-quintic Schrödinger equation in PT-symmetric potentials and obtain two families (sech-type and Gaussian-type) and four kinds of analytical light bullet (LB) solutions. The stability of these solutions is tested by the linear stability analysis and the direct numerical simulation. Results imply that sech-type LB solutions are unstable for all parameters only in the extended Rosen–Morse potentials. Sech-type and Gaussian-type LB solutions are both stable below some thresholds for the imaginary part of other PT-symmetric potentials in the defocusing cubic and focusing quintic medium, while they are always unstable for all parameters in other media. Moreover, we discuss the broadened and compressed behaviors of LBs in inhomogeneous hyperbolic system and periodic amplification system. © 2014, Springer Science+Business Media Dordrecht.

Chen Y.-X.,Zhejiang University of Media and Communications
Nonlinear Dynamics | Year: 2016

We discuss a (3+1)-dimensional variable-coefficient coupled nonlinear Schrödinger equation with different diffractions and dispersion in parity-time ((Formula presented.)) symmetric inhomogeneous nonlinear couplers with balanced gain and loss, and derive (Formula presented.)-symmetric and (Formula presented.)-antisymmetric superposed breather and crossing two-breather solutions. The recurrence of controllable superposed breathers including restraint, maintenance and postpone is firstly reported in the dispersion/diffraction decreasing system. This recurrence of controllable behaviors originates from different diffractions and dispersion of systems. Moreover, controllable excitations including restraint, maintenance and postpone of crossing two breathers are also studied in the dispersion/diffraction decreasing system. © 2016 Springer Science+Business Media Dordrecht

Chen Y.-X.,Zhejiang University of Media and Communications
Nonlinear Dynamics | Year: 2016

A ((Formula presented.))-dimensional inhomogeneous cubic–quintic–septimal nonlinear Schrödinger equation with (Formula presented.)-symmetric potentials is studied, and two families of soliton solutions are obtained. From soliton solutions, the amplitude of soliton is independent of the (Formula presented.)-symmetric potential parameter k; however, the phase depends on the parameter k. The phase of soliton alters from negative to positive values at the location of center. Moreover, the evolutional behaviors of these solitons are discussed. © 2016 Springer Science+Business Media Dordrecht

Ai S.,Zhejiang University of Media and Communications
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2011

A novel method of bearing fault diagnosis based on demodulation technique of DTCWT. It is demonstrated that the proposed dual-tree complex wavelet transform has better shift invariance, reduced frequency aliasing effect and de-noising ability. The bearing fault vibration signals were firstly decomposed and reconstructed using dual-tree complex wavelet transform. Then the real and imaginary parts were obtained and the vibration signals were amplitude demodulated. In the end, the amplitude envelope and wavelet envelope spectrum were computed. Therefore, the characteristics of the bearing faults can be recognized according to the wavelet envelope spectrum. The experimental results show that fault diagnosis based on dual-tree complex wavelet transform can diagnose bearing faults effectively under strong noise conditions and reduce spectral aliasing.

Wu Y.,Hangzhou Dianzi University | Zhang G.,Zhejiang University of Media and Communications
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

A new tolerance model by representing the position variation of control points of geometric element is proposed. The control points of point, line and plane geometric element are defined as point itself, two end points of line, any three vertices of bounding box of plane and the interior constituting points of line and plane, which are used to present the dimensional error, the position error, the orientation error and the form error. The tolerance coordinate system of target geometric element is established according to the geometric type of target geometry and datum geometry, the relative position between target geometry and datum geometry, and the precedence of datum reference frames. The degree of freedoms (DOFs) of geometry element are classified and defined under the tolerance coordinate system. The bounding box of plane is set up at the tolerance coordinate system and the variation direction of control points is defined along translational DOF of geometry element, and the variation combination of all control points are used to represent various error of geometric element. The variation of control points is controlled to follow the error probability distribution of geometric element and the definitional domain of variation parameter of control point is the tolerance zone, the restrict relationship among the control points of target element are used to represent the interaction relationship between position and orientation tolerance, and the relationship between the variation parameters of control point of target and datum element are used to represent the tolerance principles. The model is compatible with the tolerance standards and practice rules, it also suits the mathematical analysis method of many applications such as tolerance analysis, tolerance allocation and verification. © 2013 Journal of Mechanical Engineering.

Chen Y.-X.,Zhejiang University of Media and Communications
Communications in Theoretical Physics | Year: 2014

We discuss the nonlinear Schrödinger equation with variable coefficients in 2D graded-index waveguides with different distributed transverse diffractions and obtain exact bright and dark soliton solutions. Based on these solutions, we mainly investigate the dynamical behaviors of solitons in three different diffraction decreasing waveguides with the hyperbolic, Gaussian and Logarithmic profiles. Results indicate that for the same parameters, the amplitude of bright solitons in the Logarithmic profile and the amplitude of dark solitons in the Gaussian profile are biggest respectively, and the amplitude in the hyperbolic profile is smallest, while the width of solitons has the opposite case. © 2013 Chinese Physical Society and IOP Publishing Ltd.

Tian F.,Zhejiang University of Media and Communications
Journal of Multimedia | Year: 2013

The Text-to-Speech (TTS) system does rely on syllable boundary information for segmental duration. However, ambisyllabic consonants always pose a problem to TTS because the system requires clear syllable boundaries to segment and concatenate. In order to provide a possible solution to this problem, /n/ and /l/ in VLCAVR are chosen in this paper as the target to be examined whether their durations behave more like the syllabic onset or coda when comparing with the durational properties of /n/ and /l/ both as onsets in CV and codas in VC. As the syllable boundaries, onset C shows much more sensitivity to stress than coda C while coda C shows more sensitivity to syllabic position than onset C. Moreover, CA in VLCAVR is also influenced by two variables of stress and position as C in CV and VC. The results show that the intervocalic CA holds the properties of both the syllabic onset and coda, which states the possibility that intervocalic consonants should be considered as a rather independent concatenative unit in TTS synthesis. © 2013 ACADEMY PUBLISHER.

Loading Zhejiang University of Media and Communications collaborators
Loading Zhejiang University of Media and Communications collaborators