Gps tracking google maps php jobs

I have a Google ad that directs traffic to a Wix landing page. This landing page is designed for visitors to either submit a form or place a phone call. I am looking for a skilled professional to help me set up conversion tracking specifically on the Google ad. Key requirements include: - Setting up conversion tracking on the Google ad. - Tracking both form submissions and phone calls on the landing page. - Coordination with my existing Google Analytics setup on the website. The ideal candidate for this project should have: - In-depth knowledge of Google Ads and conversion tracking. - Experience in setting up conversion tracking for both form submissions and phone calls. - Familiarity with Wix websites. - Expertise in ...

I need an Android service developed that continuously captures GPS location data in the background, enabling real-time tracking. Key Deliverables: - A service that can consistently capture GPS location data in the background - even when the app is closed. - The capture precision of the location data should be within 10 meters. - This data must be updated every 5 minutes to ensure accurate real-time tracking. Skills & Experience: - Strong proficiency in developing Android services. - Prior experience with GPS location tracking in background mode. - Demonstrated ability to deliver high-precision location data.

I'm looking for a talented recruiter who's capable of identifying and hiring any-level in any industry. Key Responsibilities: - Identify and approach potential candidates. - Screen candidates through interviews and background checks. - Match candidate...Identify and approach potential candidates. - Screen candidates through interviews and background checks. - Match candidates with the right job opportunities. - Coordinate with hiring managers to understand job requirements. Ideal Candidate: - Proven experience in recruiting mid-level professionals across diverse industries. - Strong networking and communication skills. - Familiarity with applicant tracking systems. - Adept at evaluating candidate skills and experience. - Able to understand job requirements and match can...

...with WooCommerce and Selectline. - A solid understanding of PHP programming, as the project requires the use of this language. - Prior experience with inventory management systems and e-commerce platforms, to ensure a smooth and effective connection between the two. Key Synchronization Requirements: - Customer Details: The full set of customer information including name, address, and contact information must be synchronized between the platforms. - Product Details: Details such as name, SKU, quantity, price of the ordered products are to be shared between the systems. - Payment Status: Ensure the payment status of the order is accurately reflected on both platforms. - Shipping Details: Details such as shipping method and tracking number should be synchronized as well. Th...

...visitors. The primary focus of this project will be optimizing the server's Plesk settings, Postgres and MariaDB databases, and PHP 8.2 configuration. Key tasks will include, but are not limited to: - Configuring Plesk for optimal performance, including adjusting server pool size - Identifying and implementing improvements to Postgres and MariaDB settings to reduce slowdowns - Tuning PHP 8.2 to enhance website speed and performance Ideal candidates for this project will have: - Proven experience in optimizing dedicated servers, particularly with Plesk and Almalinux - A solid understanding of database optimization, including Postgres and MariaDB - Expertise in PHP configuration and optimization - Excellent problem-solving skills and the ability to work effi...

I'm seeking a skilled PHP/MySQL developer to create a custom PHP POS application. This job will require you to have good experience in PHP/MySQL. You will be paid on a task-based. We will test you with some sample tasks. To be eligible for further discussion I want you to have a look into the portal by visiting the below link and create a free account and try the portal give me one issue you have faced and can be improved in the portal. If you are unable to do above then your application will be rejected immediately.

I'm in need of a talented developer to create a robust and user-friendly ERP system tailored for my school. The system should incorporate a range of school-specific features and ensure that it can handle the significant amount of students enrolled (500 or more). Key Features: - **Student Attendance Tracking**: An essential feature that will allow efficient monitoring of student attendance. It should be easily navigable and facilitate real-time updates. - **Gradebook and Report Card Generation**: A feature that will automate the grading process, enabling teachers to input grades and generate student report cards efficiently. - **Parent Communication Portal**: A secure platform through which parents can access important information about their children's academic performanc...

...for a skilled freelancer well-versed in comprehensive social media management, specifically on Facebook and Instagram. Your tasks will include: - Creating compelling content which aligns with my brand's voice - Managing targeted ad campaigns - Analyzing campaign data for optimization - Crafting engaging video content - Boosting relevant ads - Providing weekly written reports - Establishing and tracking KPIs and ROI The main goal of this campaign is to enhance brand awareness and effectively generate leads. The intended target audience is those between the ages of 28 and 55. Ideal candidates should have a wealth of experience in social media content creation, strategic ad campaign management, data analysis, video production, and marketing report writing. Proven ability ...

I'm in urgent need of a full stack PHP developer for a custom web application. The ideal candidate should be proficient in both front-end and back-end development, as well as database management. Key Responsibilities: - Developing a custom web application using PHP - Implementing both front-end and back-end features - Ensuring proper database management Key Requirements: - Prior experience in developing custom web applications - Proficiency in PHP, with a solid background in both front-end and back-end development - Experience with managing databases - Good understanding of security and scalability - Ability to work in a fast-paced environment - Strong problem-solving skills Please note that knowledge of any specific frameworks like Laravel, CodeIgniter, or Sy...

I need a skilled PHP developer with full-stack capabilities for an urgent web application project. The primary purpose of this project is the development of a web application, with a major focus on user login and authentication. Key Tasks: - Front-end Development: The ideal candidate should be proficient in creating user-friendly interfaces that are engaging and responsive. - Back-end Development: A strong understanding of server-side languages and database management is essential for this project. - Database Integration: The successful candidate will be responsible for integrating and managing databases to ensure seamless operation of the web application. The most important feature of this web application is user login and authentication. As such, the developer should have a pro...

I'm in urgent need of a PHP developer to create and implement APIs. The API will be utilized by a frontend that's already been designed. Key Project Details: - I'm looking for APIs to cater to User authentication, Data retrieval, Data manipulation and allow for file uploads. - The project has an 'ASAP' deadline, so I'm seeking a developer who can start immediately and work quickly without compromising quality. Ideal Candidate: - Proficient in PHP and experienced in API development - Skilled in creating secure and efficient user authentication systems - Capable of executing data retrieval, manipulation, and file upload functionalities with precision and speed

...skilled Graphic Designer to create screenshots and feature graphics for an app on Google Play Store. The project involves designing 6-10 graphics in a clean and professional style. Key requirements include: - Experience in graphic design for digital products, particularly for mobile apps and the Google Play Store. - A strong portfolio showcasing your ability to create clean and professional graphic designs. - Expertise in understanding and visualizing the features and functions of an app to create compelling graphics. - A knack for providing guidance on the most effective content for these graphics, as copywriting assistance will be required. Your role will be crucial in making our app stand out on the Google Play Store, so your ability to create captivating, prof...

...sick leave, and bereavement leave to accommodate different company policies. - Provide functionalities for employees to request and track leaves such as sick leave, vacation, etc routing based on employee hierarchy to ensure that leave requests are reviewed and approved by the appropriate authorities. - Include a calendar view and yearly holiday calendar to facilitate easy leave scheduling and tracking for both employees and administrators Attendance Management: - Record employee attendance through methods biometric devices and employees can view their hours worked, breaks, and overtime. Customizable Payroll Management: - Designate authorized users to manage payroll processes like uploading or deleting payslips for each employee and Allow employee access to payslips to down...

...experience in HR processes or a similar background. What you need to do: The project is divided in 2 milestones. 1. the task is to submit the employee documents to the clinic receptionist or manager and ask them to provide us with verification . 2. second part is to make 6 geo tag pictures Of the signboard of the clinic , building, business card. By using following app . For proof of your visit we need the pictures. What I will provide: - All necessary information for you to verify the potential employee's employment history This task takes precision and attention to detail; your due diligence can have a significant impact on my organisation. Please only apply if you have relevant experience and can handle this sensitive

I currently have a PHP script that echo's the value of a MySQL db and results appear 3 to a page using Pagination. I'd like the script modified to filter results. There should be a drop down box on the page with the selections of the drop down corresponding to the table column and when selected only the rows with the value of the column appear while still only displaying 3 to a page with page back and forward controls. In the below example of a db table the drop down box would contain the selections 1, 2 and 3. When the used selects 1 then the page output would only display Bob, Jane and Sarah. This is an already existing page with css in the output. Name Address. number ------------------------------------------------------ bob brisbane. ...

I'm looking for a design expert who can transform the facade of my property to create an appealing modern minimalist aesthetic. At the core of this project is enhancing the curb appeal of my home. Key elements include: - Creating a facade design overhaul using primarily timb...design. Proficiency in architectural software like AutoCAD or Revit is a plus, but not a necessity. Relevant experience in facades renovation or restoration with a focus on modern minimalist aesthetics will be highly preferred. PLEASE NOTE: I want to keep my existing shape of roof. I have no garage - at the moment - please don't factor into design Here is my house image: @-33.8328115,150.9749173,3a,39.4y,89.53h,84.54t/data=!3m6!1e1!3m4!1s52gfI0WoklYN3w86G4jn8Q!2e0!7i16384!8i8192?entry=ttu

I am in need of a proficient and detail-oriented professional to assist with the collection and organization of crucial information for ongoing projects related to the UN System and sustainable development. The main tasks involve: - Note-taking during important meetings, - Creating concise summaries post-meetings, - Writing official statements to support communication materials and docu... This project is estimated to last for more than 2 weeks and if we like the work will keep working Reliable and timely task completion is key, as the notes, summaries, and statements will serve as meeting minutes and important project documentation influencing future decisions. All in all, the ideal freelancer should effectively contribute to enhancing our internal communication and project tra...

For this project, I require a Discourse forum on Google Cloud Platform tailored for engaging public community discussions. I want it to be professional and straightforward, reflecting reliability and efficiency. - Platform: Set up on Google Cloud Platform is required. Prior experience with this platform would be beneficial. - Audience: The forum should be set and optimized for public community discussions. - Appearance: The design theme should be professional and straightforward. Your ability to reflect this in practical design would be an advantage. I look forward to seeing your bids and working with you to create this forum.

I'm looking for an expert in Google Ad Manager who can help me improve my ad targeting for display ads. Key Requirements: - Improve my current ad targeting strategy and ensure the ads are reaching the right audience - Implement advanced targeting techniques in Google Ad Manager to increase the effectiveness of the ads - Provide insights and suggestions on how to optimize the ad targeting for better performance Ideal Skills and Experience: - In-depth knowledge and experience with Google Ad Manager - Proven track record of improving ad targeting for display ads - Strong understanding of audience segmentation and targeting strategies - Excellent analytical and problem-solving skills with the ability to interpret data and provide actionable recommendations If you ...

php 8.3 downloaded from . I require an expert in PHP installation and testing on my Windows 10 LAPTOP. I do not need Xampp or Wamp.

I am in need of a skilled C++ MFC expert, specialising in bug fixing. My software is experiencing runtime errors during specific operations, and I require assistance to diagnose and correct these glitches. - Tasks will include tracking down the source of these errors and rectifying them. Skills and Experience Needed: - Extensive knowledge and experience with C++ and Microsoft Foundation Classes (MFC) - Strong debugging skills - Proven experience in handling runtime errors - Capacity to understand complex software operations - Exceptional problem-solving abilities. If you have the relevant experience in resolving runtime errors in an MFC environment, I welcome your bid.

I'm searching urgently for an experienced PHP architect who can construct a unique e-commerce shopping cart and accompanying admin panel. Key Responsibilities Include: - Constructing a product catalog and search functionality to allow customers to easily browse and locate items. - Integrating an 'Add to cart and checkout' feature ensuring a simple and smooth transaction process. - Developing order management and inventory tracking system within the admin panel to help me keep track of orders and product stocks. Skills and Experience Required: - Proficient in PHP programming - Experience in developing e-commerce websites - Solid understanding of databases and SQL - Familiarity with different payment solutions Although there is no specific require...

...would use. There are lots of Shopify repositories here: along with lots of code on the web. Ideally much of the functionality would come from already existing code, but GPT can also be used to rapidly develop code. Here's a breakdown of the APIs, webhooks etc. needed for the functionality we'd like: 1. Order Tracking Shopify Admin API: Use this API to access and manage order data, providing real-time tracking updates to customers. Webhooks: Implement webhooks to receive real-time notifications on order status changes. 2. Shopping Cart Management Shopify AJAX API: Use this API for a seamless shopping cart experience that allows customers to add items to the cart, update quantities, and view cart contents without reloading the page. Storefront

We need a specialist to deliver a user-friendly, customizable orientated dashboard that pulls and represents data in real-time using Python and Salesforce. This task will require: - Tracking and visualizing loan applications, sales revenue (interest income), and franchise performance among other metrics. - Representation of fintech franchise lender-related metrics such as concentration by brand, average loan amount across our portfolio, target brands, US state-wise brand distribution in our franchise portfolio. - Highlighting lead conversion rates and time intervals from application to funding and status updates on total applications, approvals, declines, and those pending. - Displaying data in the form of bar charts, line graphs, and pie charts for a comprehensive understanding a...

I need a skilled developer to integrate an International Payment Gateway into my PHP-based website immediately. Integration of Payment Getway in the website which will accept USD and this should work in Both Indian people and Other Countries. Website URL is - freelancerbridge(dot)com

...of 1-2 years - A strong portfolio of previous works in the field - Familiarity with mobile app design principles - Ability to work either remotely or in an office Your primary goal will be to improve the app's usability and user experience. This will involve: - Conducting user research and testing to understand the current user experience - Creating wireframes, storyboards, user flows, and site maps to effectively communicate interaction and design ideas - Developing and maintaining detailed user-interface specifications - Designing the overall functionality of the product, and in order to ensure a great user experience, iterate upon it in accordance with user-testing - Creating user-centered designs by understanding business requirements, and user feedback - Translating h...

I am in need of a professional who can promptly install and customize a PHP script for me. The PHP script I need to be installed is purchased through codecanyon. You will install, test all functions and activate license on our server. Being somewhat urgent, my requested completion for this project is ASAP. I value efficiency and swift, quality work. Thank you

I'm seeking a skilled designer to help with creating visually appealing Google Display Ads. IMAGES ONLY SIZEs - 5 Nos 300x250 366x280 728x90 300x600 320x100 ADOBE Illustrator Files Key Objectives: - **Increase Website Traffic**: The primary goal of these ads is to drive traffic to my website. The design must be compelling and clickable, aimed at encouraging users to visit the site. Design Guidelines: - **Color Scheme**: While I have some general ideas about the color scheme, I'm open to suggestions. The ads should align with my brand's look and feel, enhancing brand awareness and recognition. Ideal Candidate: - Proficient in Google Display Ad design. - A good understanding of color psychology and design principles. - Strong portfolio demonstrating success...

I need a robust StarCloud print feature integrated to my website through PHP. I require an expert in PHP who understands how to efficiently generate receipts directly from a website. Key Features Required: - Personalized receipt printing: Upon a successful order, a receipt should be generated for that specific transaction. - Simplified design: The receipt should be simple, uncluttered and easy to read. Please note, only the code is needed, no additional information like payment or customer details should be included. Ideal skills and experience: - PHP proficiency to ensure seamless integration - Familiarity with StarCloud system - Understanding of efficient coding practices for smooth running.

I'm in need of a skilled PHP CodeIgniter Developer to help me debug my existing application. Key Points: - The main goal of this project is to fix bugs within the current application. Therefore, I require someone with a strong background in troubleshooting and debugging. - I'm specifically looking for a developer with extensive experience in PHP CodeIgniter. Therefore, please highlight your experience in this specific framework when you apply. Ideal Candidate: - Proficient in PHP CodeIgniter - Proven experience in debugging applications - Strong problem-solving skills - Excellent attention to detail - Ability to work independently and efficiently Please make sure to include your experience in your proposal. Looking forward to working together.

I urgently need a mobile app for travel developed! - The app should be compatible for Android and iOS. - The main goal is to create a platform that supports travel-related services. - The exact features will be discussed later but they will likely include, but not be limited to, features like flight and hotel booking, city guides and maps, language translation and more. - Experience in e-commerce app development will be a plus, as this app will include booking and purchasing functionality. - Ideally, I'm looking for someone who has previously worked on similar travel apps. Please bid only if you can commit to a fast-track development process, as completion of the project is needed ASAP.

I'm looking for a computer engineer with strong expertise in Google technologies. Key Requirements: - Proficiency in Operating Systems and Technical Skills: You should be well-versed in various Operating Systems and technical aspects to tackle the challenges of the project. - Google Technology Proficiency: You must have a deep understanding and hands-on experience with Google technologies, products, and services. Ideal Skills and Experience: - Previous experience in software development, network security, or hardware design would be a plus. - Strong understanding and experience in using multiple operating systems, particularly Windows, Linux, and macOS. - Excellent problem-solving skills and the ability to work independently and in a team. - A proactive approac...

I'm seeking an experienced web developer with extensive knowledge in WIX and payment gateway integration to build the checkout system of our bulk ice se...Address Input** - Allowing customers to input their delivery address to ensure proper and accurate delivery of our products. 3. **Order Confirmation Email** - After a successful purchase, an order confirmation email should be sent to customers for their records. 4. **Design** - Implement a simple and clean design that aligns with the website's current aesthetic. 5. **Delivery Tracking** - Incorporate real-time tracking of deliveries into our system to enhance customer experience. Ideal candidates should have a solid background in WIX, the know-how in integrating Quickbooks Online for invoicing, and a knack for...

1) Implement MOSSE with SCRFD for Java Android 2) Implement it in our app by replacing MLKit and connect it to our engine 3) Replace our engine with ARCface The App must be fast and robust. For the 1st milestone deliverables... implement MOSSE tracking with SCRFD for Java Android running the C++ libs. Create a demo app that runs detection and tracking and: 1. shows boxes and tracking ID for each face detected. 2. model size 3. fps 4. face confidence 5. screen resolution 6. Allow the app to run on Android's both front and back camera 7. add a zoom feature if supported by the device's camera. 8. add an option to upload and process recorded videos. no need to do ui/ux design key point is to integrate c++ library with android app Need to do some test before ...

I require a highly functional app primarily for managing service logistics and requests in real-time. The key functionalities would include: - Request Management: This will entail form creation for service requests, tracking these requests, and a streamlined approval process. Effective management of this will be crucial. - Service Logistics Management: This involves scheduling services meticulously, optimizing routes for efficient service delivery, and continuous tracking of services. Knowledge and proficiency in Laravel 10, PostgrestSQL 16, Ionic 7, and Angular 17 would be vital for this project. Notifications should update in real time to reflect status changes. I'm keen on an easy to navigate administrative panel for the web application. The mobile application shou...

...application should accurately count cars passing through multiple cameras using RTSP live streams. Key Requirements: Modular Design: The software should have a configurable region of interest (ROI). This will allow customization of the tracking area for different camera setups. The system should support settings for either two-way or single direction vehicle detection, selectable per camera. Multi-Camera Support: The application must handle live feeds from at least three cameras simultaneously without frame skipping. Ensure seamless capturing, detecting, and tracking across all cameras, maintaining high accuracy and performance. Error Handling: Implement robust error handling to ensure the application runs continuously without crashes. Auto-recovery features should be in...

I am urgently seeking an expert to create a highly functional and streamlined tracking spreadsheet for multiple facets of a construction project. Ideal candidates should be well-versed in project tracking/reporting, with a profound understanding of construction processes, including: - Timeline: The ability to articulate project deadlines and various stages of the construction in a clean, easy-to-understand calendar view. - Material Inventory: Significant experience creating systems for tracking material usage, including real-time updates, order monitoring, and being able to predict future needs. - Work Progress: Demonstrate a robust understanding of work progress tracking across multiple work fronts, and be able to visualize the progress in a tangible way for s...

as discussed in chat, this is a fixed price for 3 Domains configuration on Google Workspace

Good evening, I need help with a Python assignment and I also need programming tutorials in java, Python, mvc, php, Javascript, mysql, jQuery, html, css, asp.net, c#. The tutorials would be in Spanish. I need them as soon as possible.

As a business with diverse inventory, I am in need of an application to generate unique SKUs, track their usage, and store pertinent SKU information. A distinctive facet of the project will be the creation of a custom format SKU algorithm incorporating department codes, which will ensure efficient identification and organization on our part. As such, a freelancer with a background in invent...management systems or similar projects would be advantageous. This job will require: We have a convention to follow for creation of the SKU IDS. Furthermore I want the ability to add product images at the time of generating the SKU. - Strong knowledge in application development. - Experience with custom format algorithms. - Understanding of department code incorporation. - Skills in SKU usage tra...

I'm in need of a skilled software engineer to work on a swim software project. This project involves integrating the new sw...swim software to enhance its functionality: - Payment Processing: An integrated payment processing system for users to make payments seamlessly within the software. - Attendance Tracking: A feature to keep track of attendance for different events or sessions. - Multiple Language Support: The software should support multiple languages to cater to a wider audience. Ideal candidates for this project should have experience in software development, particularly in creating registration systems and integrating software with other existing systems. Experience with payment processing systems, attendance tracking, and multi-language support would be...

Need the work to start right away with fast turnaround. Convert a pdf to a google doc so the text can be editable.

...help with a project regarding my website. I have Google Analytics installed on my WordPress site, but I want to rebuild it to better focus on tracking website traffic. I would also like to integrate a Consent Management Platform (CMP) via Google Site Kit to ensure I'm compliant with various privacy regulations. Key tasks may include: - Rebuilding Google Analytics to focus on tracking website traffic - Integrating a Consent Management Platform (CMP) via Google Site Kit Ideal skills for this project include: - Strong understanding of Google Analytics - Expertise in WordPress - Experience with integrating and configuring a CMP - Proficiency in setting up Event tracking in Google Analytics - A fully operational Googl...

I am in need of a custom HR Applicant Tracking System with key features including applicant tracking, interview scheduling, and a complete onboarding process. Ideal candidates will have experience in: - Developing HR software with a focus on applicant tracking - Implementing features such as interview scheduling and onboarding - Understanding of workflows and fields customization - Creating user-friendly systems for HR managers The system should be easy to use while meeting the needs of HR professionals. Please consider adding in your proposal any relevant experience you have in this field. Thank you.

More details: What platforms would you like the auto-rickshaw booking app to be developed for? Both What specific features should be included in the app? Real-time tracking, Integrated payment system, User rating system Do you have any design preferences for the app? Minimalistic and clean We can book auto using mobile phone, online through web portal and kiosk in the exhibition.

...grant funding prospects to match our businesses priorities; * Generates high-quality proposals, narratives, applications and supporting documents and the requirements and guidelines of the funding agencies; * Generates revenues for GC programs through timely submission of well-researched, well written and well-documented grant proposals. * Maintains primary responsibility for grant schedules and tracking grants; * Serves as a liaison to all funding agencies and organizations; * Works with appropriate personnel to research, develop, write and submit letters of inquiry, concept papers and grant proposals; * Coordinates and follows-up on the progress of submitted proposals; Institutional Effectiveness; • Develops and maintains a master file on pending grants and contracts; &bu...

...that allows for efficient tracking and management of customer orders, inventory, and shipping. Key Features: 1. Customer Management - Store customer information including name, address, email, and phone number. - Track customer order history. - Customer feedback and preferences. 2. Inventory Management - Maintain a detailed list of products, including product ID, name, description, quantity in stock, and reorder levels. - Automated alerts for low stock levels. 3. Order Management - Enable creation of new orders with customer information, order details (product, quantity, price), and shipping method. - Track order status (received, processing, shipped, delivered). - Generate invoices and receipts for orders. 4. Shipping and Delivery Tracking - Rec...

I need a pr...help me remove 10 spam listings from Google Maps. Your main aim should be to ensure a clean, accurate and effective Google Maps experience for users. Requirements: - Ability to efficiently identify listings as spam based on incorrect information, fake reviews and breaking of guidelines. - Experience in Google Maps edits and removals. - Strong attention to detail to ensure spam listings are effectively identified and removed. - Clear and concise communication skills. Additional Information: - You will be provided with a list of the spam listings. - We will expect the listings to be removed permanently and efficiently, without any negative repercussions to our standing on Google Maps. Please only apply if you have a...

I'm seeking a skilled marketing professional to construct a comprehensive investment offering. This is projected to facilitate the acquisition of an apartment complex in the next 3 months. **We will collaborate on the financial projections, specific business plan, etc. - we need someone who can beautify the hard data (text/financial projections/graphs/maps) and make it digestible to read for a prospective investor. Our end goal is to have TWO forms of this investment offering (a summary teaser that is high-level, and a more granular deck that contains additional detail) that we can recycle on future acquisitions by altering text & numbers without having to re-create the entire pitch** The offering must contain: - Detailed information on the property and a projecti...

I require a data report which focuses primarily on the tracking of conversion actions on a monthly and yearly basis. In particular, the report should include: - Detailed analysis of our conversion tracking data - Breakdown of the converted actions recorded throughout each period To take on this project, you must: - Have experience in analyzing conversion data - Have an understanding of key performance indicators (KPIs) - Be proficient at creating detailed, clear, and action-oriented reports Ultimately, I'm aiming to examine and understand the sequences leading up to conversion actions, in hopes of enhancing strategies to further boost conversions.