Controlling exposures to hazards in the workplace is vital to protecting workers. The hierarchy of controls is a way of determining which actions will best control exposures. The hierarchy of controls has five levels of actions to reduce or remove hazards. The preferred order of action based on general effectiveness is:
Administrative controls and PPE require significant and ongoing effort by workers and their supervisors. They are useful when employers are in the process of implementing other control methods from the hierarchy. Additionally, administrative controls and PPE are often applied to existing processes where hazards are not well controlled.
Definition: The visual hierarchy of a 2D display (webpage, graphic, print, etc.) refers to the organization of the design elements on the page so that the eye is guided to consume each design element in the order of intended importance.
Good visual design uses color or contrast (or both) to create visual hierarchy on the page. Applying color to a design makes some elements appear to advance and others to recede, and, thus, determines what grabs our attention and the importance we assign to various design elements.
Designers often also use type contrast to indicate hierarchy, signaling importance with a special font treatment. Typefaces with heavy weight, like bold, stand out against light-weighted or regular typefaces. Words styled differently than the surrounding text (e.g., italic or underlined) also attract attention.
In design school, we are taught to squint or apply a slight blur to the design to get an idea of the conveyed groupings and hierarchy. This technique highlights what is emphasized in the design and uncovers the underlying hierarchy.
Before beginning a design, take a step back from the visuals and define the hierarchy of the content and the key point(s) you want the user to take away. Once you establish that hierarchy, focus on applying variations in color and contrast, scale, or grouping. After designing with visual hierarchy in mind, step back and see if the design reads as you intended it by testing with target users.
A robots.txt file is not an appropriate or effective way of blocking sensitive or confidential material. It only instructs well-behaved crawlers that the pages are not for them, but it does not prevent your server from delivering those pages to a browser that requests them. One reason is that search engines could still reference the URLs you block (showing just the URL, no title link or snippet) if there happen to be links to those URLs somewhere on the Internet (like referrer logs). Also, non-compliant or rogue search engines that don't acknowledge the Robots Exclusion Standard could disobey the instructions of your robots.txt. Finally, a curious user could examine the directories or subdirectories in your robots.txt file and guess the URL of the content that you don't want seen.
If your document appears in a search results page, the contents of the element may appear as the title link for the search result (if you're unfamiliar with the different parts of a Google Search result, you might want to check out the anatomy of a search result video).
A page's meta description tag gives Google and other search engines a summary of what the page is about. A page's title may be a few words or a phrase, whereas a page's meta description tag might be a sentence or two or even a short paragraph. Like the element, the meta description tag is placed within the element of your HTML document.
Write a description that would both inform and interest users if they saw your meta description tag as a snippet in a search result. While there's no minimal or maximal length for the text in a description meta tag, we recommend making sure that it's long enough to be fully shown in Search (note that users may see different sized snippets depending on how and where they search), and contains all the relevant information users would need to determine whether the page will be useful and relevant to them.
Having a different meta description tag for each page helps both users and Google, especially in searches where users may bring up multiple pages on your domain (for example, searches using the site: operator). If your site has thousands or even millions of pages, hand-crafting meta description tags probably isn't feasible. In this case, you could automatically generate meta description tags based on each page's content.
Once you've marked up your content, you can use the Google Rich Results test to make sure that there are no mistakes in the implementation. You can either enter the URL where the content is, or copy the actual HTML which includes the markup.
Google recommends that all websites use https:// when possible. The hostname is where your website is hosted, commonly using the same domain name that you'd use for email. Google differentiates between the www and non-www version (for example, www.example.com or just example.com). When adding your website to Search Console, we recommend adding both http:// and https:// versions, as well as the www and non-www versions.
Make it as easy as possible for users to go from general content to the more specific content they want on your site. Add navigation pages when it makes sense and effectively work these into your internal link structure. Make sure all of the pages on your site are reachable through links, and that they don't require an internal search functionality to be found. Link to related pages, where appropriate, to allow users to discover similar content.
Use a directory structure that organizes your content well and makes it easy for visitors to know where they're at on your site. Try using your directory structure to indicate the type of content found at that URL.
It's always beneficial to organize your content so that visitors have a good sense of where one content topic begins and another ends. Breaking your content up into logical chunks or divisions helps users find the content they want faster.
Another example when the nofollow attribute can come handy are widget links. If you are using a third party's widget to enrich the experience of your site and engage users, check if it contains any links that you did not intend to place on your site along with the widget. Some widgets may add links to your site which are not your editorial choice and contain anchor text that you as a website owner may not control. If removing such unwanted links from the widget is not possible, you can always disable them with nofollow. If you create a widget for functionality or content that you provide, make sure to include the nofollow on links in the default code snippet.
After you have created a mobile-ready site, you can use Google's Mobile-Friendly Test to check if pages on your site meet the criteria for being labeled mobile-friendly on Google Search result pages. You can also check out the Search Console Mobile Usability report to fix mobile usability issues affecting your site.
Deploy Azure IoT Edge nodes across networks organized in hierarchical layers. Each layer in a hierarchy is a gateway device that handles messages and requests from devices in the layer beneath it. This setup is also known as \"nested edge\".
You can structure a hierarchy of devices so that only the top layer has connectivity to the cloud, and the lower layers can only communicate with adjacent north and south layers. This network layering is the foundation of most industrial networks, which follow the ISA-95 standard.
The goal of this tutorial is to create a hierarchy of IoT Edge devices that simulates a simplified production environment. At the end, you will deploy the Simulated Temperature Sensor module to a lower layer device without internet access by downloading container images through the hierarchy.
To accomplish this goal, this tutorial walks you through creating a hierarchy of IoT Edge devices, deploying IoT Edge runtime containers to your devices, and configuring your devices locally. In this tutorial, you use an automated configuration tool to:
If you would like an entirely automated look at setting up a hierarchy of IoT Edge devices, you can follow the scripted Azure IoT Edge for Industrial IoT sample. This scripted scenario deploys Azure virtual machines as preconfigured devices to simulate a factory environment.
This tutorial uses a two device hierarchy for simplicity, pictured below. One device, the top layer device, represents a device at the top layer of the hierarchy, which can connect directly to the cloud. This device will also be referred to as the parent device. The other device, the lower layer device, represents a device at the lower layer of the hierarchy, which cannot connect directly to the cloud. You can add more lower layer devices to represent your production environment, as needed. Devices at lower layers will also be referred to as child devices.
A Bash shell in Azure Cloud Shell using Azure CLI v2.3.1 with the Azure IoT extension v0.10.6 or higher installed. This tutorial uses the Azure Cloud Shell. If you're unfamiliar with the Azure Cloud Shell, check out a quickstart for details.
A Linux device to configure as an IoT Edge device for each device in your hierarchy. This tutorial uses two devices. If you don't have devices available, you can create Azure virtual machines for each device in your hierarchy using the command below.
IoT Edge devices make up the layers of your hierarchy. This tutorial will create a hierarchy of two IoT Edge devices: the top layer device and its downstream, the lower layer device. You can create additional downstream devices as needed.
To create and configure your hierarchy of IoT Edge devices, you'll use the iotedge-config tool. This tool simplifies the configuration of the hierarchy by automating and condensing several steps into two: 153554b96e