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Berkeley yacc with Java output

Mikkel Bjoern, a gifted math student in Denmark is using Maple to study in a unique way – by teaching other students. Already possessing an aptitude for math, Mikkel devotes part of his time to teaching younger students, and is able to learn more in the process. Mikkel has already passed math curriculum and exams that are at least a year advanced than his year of study. He now uses Maple to study chemistry, math and physics as well as participate in many competitions.

Danfoss North America recently signed a power purchase agreement with CIG Capital, a U.S.-based project financing firm, to purchase about 75 MW of solar power from a solar farm in Texas, starting in 2025.

Audax Private Equity announced that it has partnered with management to acquire Source Refrigeration & HVAC Inc. from Arsenal Capital Partners. Source, headquartered in Anaheim, California, is a leading independent provider of commercial refrigeration and HVAC services in North America.

The tech who showed up to the house was probably just as surprised as I was that my dad was getting the ducts cleaned. But he saw this appointment as an opportunity, not a waste of time. He talked to my dad, found things out about him and the house. Because he spent just a few minutes with my dad, he was able to add on additional products and services. That tech turned a $375 duct cleaning job into a $1,500 IAQ solution job.

Getting a humidification system dialed in is crucial if customers want to reap all the benefits they have to offer.

The Verified Market Research Report shows that the heat pump market is valued at $74.73 billion in 2024 and is expected to reach $167.32 billion by 2031.

The NSF is providing a grant to six universities, which will work together to create sustainable refrigerant technologies.

HVAC contractors have to focus on recruiting and retaining technicians by focusing efforts on learning and then providing what the current workforce is looking for.

This package has an intuitive operator touchscreen to access the HVAC H300 VFD and bypass setup options. It also displays complete system status information.

A new report, “Global Construction 2030,” forecasts that the volume of construction output will grow by 85 percent to $15.5 trillion worldwide by 2030, with three countries — China, the U.S., and India — leading the way and accounting for 57 percent of all global growth.

Struggling to grow revenue past $500K, Lavender transformed their operations with Sera, the all-in-one FSM solution.

ServiceTitan software is a platform where residential HVAC, plumbing, and electrical businesses can access everything from call bookings, customer experience ratings, dispatching, marketing campaigns, and financing options for customers.

Johnson Controls has been recognized by independent analyst firm Frost & Sullivan with its Best Practices Customer Value Leadership Award for 2022.

Through the new integration, ecobee thermostat owners who also own Generac home standby generators can easily see the status of the generator and remedy potential issues.

Sales of VRF systems continue to rise unabated, leading many to predict their shipments will increase by double digits annually for the foreseeable future.

Posted by Solar Designer on Nov 12

Posted by Clemens Lang on Nov 12

Posted by Joel GUITTET on Nov 12

As people around the world prepare to celebrate Earth Day, it’s a good time to incorporate renewable energy solutions, like Thermal Energy Networks (TENs), into the ongoing conversation.

The latest rule will require every mobile home gas furnace — and every new residential, non-weatherized gas furnace — to have a minimum annual fuel utilization efficiency (or AFUE) of 95% starting in late 2028.

Ruby has been getting more and more attention by the developer community over the last couple of years. Nevertheless Ruby as language and as a plattform is not too widespread. Most developers don't know people who have actually done commercial Ruby projects. Therefore it is sometimes hard to judge if Ruby is just a hype topic or if Ruby can be used for serious projects today. In this episode Alexander speaks with Thomas Quas about a commercial Ruby project Thomas finished a while ago. Thomas shares his insights and practical experiences with Ruby doing a project under strong time pressure. As Thomas has many years experience doing Java projects we also do some high level comparisons between both platforms.

In this episode, Arno and Michael take a look at Design by Contract, a programming technique formalized by Bertrand Meyer. The idea is that an interface is more than method signatures - it is also about specifying the expected behavior that implementations must provide. While some languages include direct support for this style of programming, it is a useful mindset when desiging interfaces even without such language features.

In this episode, we're talking to Obie Fernandez about agile DSL development in Ruby. We started our discussion by defining what a DSL is, the difference between internal and external DSLs as well as the importance of the flexibly syntax of the host language in order to make DSLs worthwhile. We then looked at a couple of real world examples for DSLs, specifically, at Business Natural Languages. We then progressed to the main part of the discussions, which centered around the features of Ruby that are important for building DSLs. These include the flexible handling of parentheses, symbols, blocks as well as literal arrays and hashes. We then discussed Ruby's meta programming feautures and how they are important for building DSLs: instantiation, method_missing callback, class macros, top level functions and sandboxing. Features like eval, class_eval, instance_eval and define_method are also important for DSLs in Ruby, as well as using alias_method for simple AOP.

István Lam of Tresorit talks with host Kim Carter about GDPR (the EU General Data Protection Regulation, which has been described as “the most important change in data privacy regulation in 20 years.”)  The discussion covers terminology, planning, implementation, users' rights regarding their personal data, managing personally identifiable information (PII) across an organization, and required documentation. István talks about establishing the intent of different types of PII; when data can be shared or sold, when PII can be stored; storage of backups, and the ability to reveal, modify, or remove all of a customer's PII.

Aaron Patterson of GitHub discusses the Ruby language and its runtime.  Host Jeremy Jung spoke with Aaron about the Ruby language and how it works.  They discuss the language virtual machine, concurrency, garbage collection, and JIT compilation.

At AMD Financial Analyst Day 2020, Mark Papermaster unveiled the AMD computing roadmap for 2020 and beyond. Check it out!... [PCSTATS]

A Pennsylvania man is challenging mandatory life without parole sentencing for felony murders in a case that has national implications.

Donald Trump’s debunked claims tap into a centuries-long racist narrative that has real impact on Haitian immigrants and Haitian Americans, in Ohio and beyond.

While Project 2025 would stymy climate data collection, a network of grassroots volunteers are braving hurricanes—including Milton and Helene—to collect and share local data that can ultimately save lives.

Long harmed by patriarchal, casteist norms within the legal system, women in India are implementing women-centered forms of grassroots justice.

In times of trouble, cowards choose the easiest path. It is only the courageous—and almost always those who are most marginalized—who dare to say and do the hard, but right, thing.

New research shows the amount of carbon dioxide released into the atmosphere from private jets between 2019 and 2023.

The utility's five-year capital plan totals $63 billion, 80% of which will support investments in grid modernization and zero or lower-carbon emitting generation.

I found a great resource by Joyce Valenza on Never Ending Search that I wanted to share with you. In her post, Google search by usage rights, she demonstrates an easy way to find copyright-friendly images on Google Image Search.

First, enter your search term into Google Images and then click on Search Tools and then Usage Rights.

From a communication point of view, each system plays the role of either supplier or consumer of information, or more typically both. In addition to this intersystem communication, these systems consist of subsystems with specific internal communications. The following paragraphs... Read more

The post Conceptual Model of Smart Grid Framework by IEC appeared first on EEP - Electrical Engineering Portal.

The Substation Automation Systems, often known as SASs, are responsible for a tremendous variety of tasks. These include some extremely important actions, such as clearing faults in a timely manner in order to maintain the physical condition of power system... Read more

The post The true art of control, monitoring and protection provided by Substation Automation Systems appeared first on EEP - Electrical Engineering Portal.

Every nation has numerous vital facilities that are largely dependent on electricity to function. Infrastructures that are critical to a quick response to outages include the public health system, the communications sector, and government services like emergency first responders. Nonetheless,... Read more

The post How (should) power utilities handle grid failures by utilizing mobile substations appeared first on EEP - Electrical Engineering Portal.

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This series is all about reversing a negative company culture, and its effects. 

Culture doesn't just happen overnight, and when a healthy culture isn't created and nurtured, negativity and an unhealthy environment can quickly follow.