B-qtech Website

[Christa Voth]

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This 4-hour HVAC training online video series explores the steps that are required for an experienced HVAC Technician to understand Hydronics in both heating and cooling, as well as the use of hot water and steam.

Targeted to field personnel, but it is open to anyone interested in understanding the basics in heating and cooling in duct systems.

*Bronze Member price. Save more with Gold or Silver ACCA Memberships.

The concept of hydronics is defined and the scope is explained. Hot water boiler types, heat exchangers used and the different fuels are detailed. A methodology for trimming a boiler is offered and an explanation of all components is given for two, multi-zone systems, using circulators and zone valves. The concepts of air-blocking and pressure are considered. The installation and operation of water side components, i.e., expansion tanks, air scoops, low water cut-offs and automatic air vents are explained. Boiler water pH, en-trained gasses and minimum return temperature are detailed. The venting requirements for direct and non-direct venting of boilers are explained. And much more!

Upon successfully passing the exam a certificate of completion is issued. To receive CEU/CEH credits from a variety of organizations, you are responsible for providing a copy of the certificate to the appropriate certification body. See below for the full list of CEUs. ACCA will maintain your transcript as proof of your credentials.

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I used 'composer update', which updated a few packages. During the updating process the website still functions. However, after it says 'The compiled services file has been removed', the website doesn't load and instead says:

The weirdest thing is, when I run 'composer update' again, the website starts to work again, until the compiled services file is removed, at which point it throws the same error again. I have already tried the usual things that should be done when this error appears (chown -R everything to the right user/group and chmod all the files and folders 664 and 775 respectively).

I am using Amazon Web Services' Elastic Beanstalk to host my Laravel project. As I just started using Laravel I do not have much idea about its functioning. Two days back My new deployments were all crashing midway with OP's error message.

Im using cmder on windows 10 in non elevated mode (Non-Admin).command php artisan cache:clear did not work for me.The folder bootstrap/cache did not exist.I created the folder and removed readonly from both bootstrap and bootstrap/cache folder.Both composer install and composer update are working now.

I don't imagine what I got done wrong with that before and no games around with that cashclearings had sense. But as it claims there was no 'cache' folder inside /bootstrapp . Had to have create it manually. Now it all rocks ok again

Conventional frequency selective surface consists of a two-dimensional (2-D) periodic array of unit-cells, which are either printed on a dielectric substrate or etched out of a conductive surface. These simple 2-D surfaces suffer from poor frequency selectivity and unstable response under different incident angles. Recently, an innovative concept of three-dimensional (3D) frequency selective structure (FSS) was proposed to alleviate the disadvantages of traditional frequency-selective surfaces. The new type of 3-D frequency selective structure is composed of a 2D periodic array of vertically placed microstrip lines, which is very promising for the realization of compact high-performance FSSs. This talk will introduce the proposed 3-D frequency selective structure. Mode-matching formulation for analyzing the structure will be briefly presented and equivalent circuit model will be employed to explain the operating principle of these three-dimensional FSSs. A number of design examples will be presented to demonstrate the high performance filtering response of 3D FSSs. Possible research topics for further investigation are suggested and existing challenges are also mentioned at the end of the talk.

Dr. Zhongxiang Shen received the B. Eng. degree from the University of Electronic Science and Technology of China, Chengdu, China, in 1987, the M. S. degree from Southeast University, Nanjing, China, in 1990, and the PhD degree from the University of Waterloo, Waterloo, Ontario, Canada, in 1997, all in electrical engineering.

From 1990 to 1994, he was with Nanjing University of Aeronautics and Astronautics, China. He was with Com Dev Ltd., Cambridge, Canada, as an Advanced Member of Technical Staff in 1997. He spent six months each in 1998, first with the Gordon McKay Laboratory, Harvard University, Cambridge, MA, and then with the Radiation Laboratory, the University of Michigan, Ann Arbor, MI, as a Postdoctoral Fellow. In Jan. 1999, he joined Nanyang Technological University, Singapore, as an assistant professor. He has been an associate professor in the School of Electrical and Electronic Engineering, NTU, since Jan. 2004. Dr. Shen served as Chair of the IEEE MTT/AP Singapore Chapter in 2009. He is currently the Chair of IEEE AP-S Chapter Activities Committee.

His research interests include design of small and planar antennas for various wireless communication systems, analysis and design of frequency-selective structures, hybrid numerical techniques for modeling RF/microwave components and antennas. He has authored or co-authored more than 126 journal papers (among them 70 were published in IEEE Journals) and presented more than 120 conference papers.

A map of the Campus and travel information can be found on the main college website.

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