Python Script For Solving mp2 Equations- An Ultimate Guide


The MP2 (Møller-Plesset perturbation theory) method is a quantum chemistry method that provides a way to improve upon the accuracy of molecular electronic structure calculations by taking into account electron correlation. It is an iterative method that begins with a wave function calculated using a lower level of theory, such as Hartree-Fock theory, and then uses perturbation theory to include corrections to the wave function to account for electron correlation.

In order to solve MP2 equations, it is necessary to have already performed a calculation using a lower level of theory, such as Hartree-Fock theory, to obtain an initial wave function and set of molecular orbitals. These orbitals are used as a basis to expand the wave function, and the MP2 method involves evaluating integrals over these orbitals to obtain corrections to the wave function.

One of the key equations used in the MP2 method is the energy correction equation, which is used to calculate the energy correction due to electron correlation:

E_corr = 1/4 * Sum_ijab (ij|ab – ib|aj) * (2*(ij|ab) – (ij|ba)) / (e_i + e_j – e_a – e_b)

In this equation, the indices i, j, a, and b refer to the molecular orbitals, and the (ij|ab) term represents the two-electron integral over these orbitals. The energy correction is then added to the energy obtained from the lower level of theory to obtain the final energy for the system.

To implement the MP2 method in a python script, it is necessary to have a way to evaluate the two-electron integrals and to perform the necessary summations over the molecular orbitals. This can be done using a quantum chemistry library, such as PySCF or Psi4, which provide functions for evaluating these integrals and for performing the necessary summations.

Once the energy correction has been calculated, it can be added to the energy obtained from the lower level of theory to obtain the final energy for the system. This energy can then be used to obtain other properties of the system, such as the dipole moment or the atomic charges, using appropriate equations.


In summary, the MP2 method is a useful tool for improving the accuracy of molecular electronic structure calculations by taking into account electron correlation. It involves evaluating integrals over molecular orbitals and performing summations to obtain corrections to the wave function. These calculations can be implemented in a python script using a quantum chemistry library.

Hope this article from Hire tech firms helps you! Happy coding!

How to Create a POS System From The Scratch In Java

Introduction- Create a POS System in Java

Creating a point-of-sale (POS) system from scratch in Java requires a combination of programming skills and a basic understanding of how POS systems work. A POS system is a computerized system that is used to process transactions and manage inventory in a retail or hospitality setting. It typically consists of a computer, a printer, a cash drawer, a barcode scanner, and a customer-facing display.

The first step in creating a POS system in Java is to determine the requirements and goals of the system. This will help to guide the design and development process.

Some common features that may be included in a POS system include:

  • Inventory management

This includes the ability to add, delete, and modify inventory items, as well as track inventory levels and generate reports.

  • Sales processing

This includes the ability to process transactions, accept various forms of payment (e.g. cash, credit card), and generate receipts.

  • Customer management

This includes the ability to store and retrieve customer information, such as contact details and purchase history.

Once the requirements have been defined, the next step is to design the user interface (UI) of the POS system. This typically involves creating a layout that includes the various input and output elements, such as buttons, text fields, and display screens. It is important to consider the usability of the UI and make it easy for users to navigate and perform common tasks.

The next step is to implement the functionality of the POS system. This will involve writing Java code to handle tasks such as processing transactions, managing inventory, and interacting with hardware components such as the cash drawer and barcode scanner. Depending on the complexity of the system, this may involve writing code to communicate with external databases or servers, as well as implementing security measures to protect against fraud and unauthorized access.

Once the functionality of the POS system has been implemented, it is important to test and debug the system to ensure that it is working correctly. This may involve running unit tests to validate individual components, as well as performing end-to-end testing to ensure that the system is functioning as expected in a real-world scenario.

Finally, it is important to document the POS system thoroughly. This may include creating technical documentation for developers, as well as user manuals and other materials for end users. This will help to ensure that the system is easy to maintain and update over time.


In summary, creating a POS system in Java involves defining the requirements and goals of the system, designing the user interface, implementing the functionality, testing and debugging the system, and documenting the system thoroughly. By following these steps, it is possible to build a powerful and reliable POS system from scratch using Java. Hope this article from Hire Tech Firms helped you! Happy coding!

Building Set WallPaper Button in React Native App

Building Set WallPaper Button in React Native App


Using React Native for numerous app functionality has been helpful. As a developer, you can easily integrate third-party native libraries in the root directory of the app. React Native app development company rely on the framework to shorten the sidelines and at the same time make the app much lighter. In this tutorial blog, I will show how you can use the third-party React Native package to build the ‘SET WALLPAPER’ button in your React Native app.

Let’s understand what are the prerequisites you need to meet.

Pre-required conditions

  • Get the React Native environment in your system- For this you have to download all the software. Sneak peek into the tutorial blog to get a detailed explanation of how to do it.
  • You should have the basic idea of creating a React Native app. Since the current blog is an intermediate phase of creating a ‘SET WALLPAPER’ button with which users can change their wallpaper, a basic understanding of the app building process will help you to grasp the learnings. Check this article at Hire tech firms if you want a guided solution.

Third-party React Native plugin

React Native framework has two tools namely React Native CLI and Expo CLI. you can use either of the tools to create apps. If you’re wondering if both the tools can   be used to create apps then whether there is any difference between them. Yes, there are a multitude of differences. The most important being the support for third-party in the React Native CLI which is not available in Expo CLI. It makes the former tool much more effective in creating apps. You don’t need to make the app size unnecessarily large. You only need to find whether the features you want to integrate with your app are available in the react Native framework or not. If it does not, you have to install the required third-party packages.

For this project, you need the third-party plugin react-native-set-wallpaper. It helps in setting wallpaper.  You need to import WallPaperManager from react-native-set-wallpaper. To install the package, run npm install –save react-native-set-wallpaper on the command prompt. You will also find other dependencies  installed in  the package.json folder of the app’s root directory. However, they are not used for this project.

Used React Native components

  • Text- A React Native component used for adding text elements to the app’s interface. You can use different props under this component. Some of them are accessible, adjustsFontSizeToFit, allowFontScaling, accessibilityActions and oneAccessibilityActions and others.  You have to get the component from the ‘react-native’ using the codeline: import {Text} from ‘react-native’.  This way, you can use the Text component later in your code.
  • View- View component is always used while creating the UI of the app. You can hold other React Native components like Button and Text with <View></View>  You can als refer to this component as a container. You can include 0 to numerous child components in a View component.
  • Button- Every app needs a press able button which users use to navigate through the app. The best part about the component is that you can customize the component with various props like onPress, color, title and others. Among these props, onPress is specifically a Handler which is called after the user clicks the button.
  • StyleSheet- A styling component, StyleSheet can be used differently. Here, in our project, although we have imported the component from the ‘react-native’ package, we have not used it further for styling.

Let’s get into the interpretation of the code syntax

import {Button, StyleSheet, Text, View} from ‘react-native’;

import React from ‘react’;

import WallPaperManager from ‘react-native-set-wallpaper’;

The first lines of coding specify what components are used to build the app. Here, the components are Button, Stylesheet, View, Text, React and WallPaperManager. As you notice that these components are imported from different libraries. This is the ke rues that you, as React Native developer, needs to follow. The component WallPaperManager   is not available in the React Native framework. So I have to get it from the third-party native library.

export default function App () {

This syntax exports the App () function using the export default. You can easily import it in other files whenever you need to use this component or function.

const handle = () => {



uri: ‘’,


res => {





Const is used to introduce a constant variable handle = () => {…}. I used const to make the image source provided under the uri as wallpaper.  The WallPaperManager has two arguments namely uri and res.  These are the strings which you need to use as arguments. Also, you have to include the console.log () function to print the res on the log. You can add different image sources to get different images as your app wallpaper. However, for this, you need to use the WallPaperManager.setWallpaper() function.

return (



<Button title=”Set Wallpaper” onPress={handle} />




const styles = StyleSheet.create({});

Now the syntax specifies the use of the View component. It holds the Text and Button component. You can see that the Button has a title “SET WALLPAPER” on it. It also has onPress props which will call the constant Handle variable and change the wallpaper of the user.

Let’s get started with starting the emulator

It will require one or two steps and your app will start on the virtual device you have set up at the beginning.

  • Open a command prompt on your system and pass npm install. This way, you will get the dependencies required for this project.
  • Then pass a command npx react-native run-android on the same terminal. You need to wait for some time until the emulator bundles and starts.
  • Your app will show a blue clickable button with a title ‘SET WALLPAPER’. Don’t forget to check the initial wallpaper before clicking the button or else you won’t notice the change.
  • After clicking the button, go to the homepage and you will see a changed wallpaper similar to the source image you provided in the codebase.


Now you are done with creating a button with which you can easily change the wallpaper. Happy coding!!!

The Role of Artificial Intelligence in Web3

The Role of Artificial Intelligence in Web3

* Introduction

Web3 is a broad term for an imagined third generation of the internet in which decentralization has led to a more equitable distribution of the internet’s power and benefits. Some large tech firms will no longer be able to control the core features of the web.

Users will have complete control over their information, privacy will be protected, censorship will be nonexistent, and rewards will be distributed fairly in a decentralized system.

The current paradigm places a premium on web centralization, which has been instrumental in the rise of AI. Now, with all this talk about Web3, what exactly is AI’s place in the future of a decentralized society? And how should we go about untangling AI’s centralization tendencies?

Let’s explore this blog and know how Artificial Intelligence in web3 can bring new changes to this technology era.

* What is Web3?

To understand Web3, it makes sense to understand what came before.

  • Web 1: The original Internet, or Web 1, debuted in the late 1990s and was made up of a network of linked websites. The websites were not interactive. Reading and publishing content was only possible.
  • Web 2: The current iteration of the World Wide Web, or “Web2,” is the one most people are familiar with. In web2, businesses willing to offer their services in exchange for access to your private information have taken over the internet.
  • Web3: Web3 is the third generation of the World Wide Web, the decentralized web that promises to connect people and devices worldwide without centralized intermediaries.

The decentralized web is driven by a network of interconnected individuals, unlike the traditional web, which depends on centralized authorities like governments and corporations to provide content and services.

This peer-to-peer network allows for direct interactions between users without intermediaries.

* Prominent Characteristics of Web3

  • Decentralization: Web3 would allow information to be stored in multiple locations across a network. This would enable users to have greater control over the vast databases.
  • Permissionless and trustless: Web3 is decentralized and based on open-source software, making it possible to share and access information without permission or trust in a centralized authority. Web3 apps that run on blockchains are called dApps.
  • Artificial intelligence (AI) and machine learning: Using Semantic Web principles and natural language processing, Web3 will implement AI and machine learning to give computers human-level data comprehension.
    Connectivity: Information and content are more connected with web3 and are accessible by multiple applications.

* What is AI?

The term “artificial intelligence” (AI) refers to the process by which computers can mimic human intelligence. Some examples of AI are expert systems, natural language processing (NLP), speech recognition, and computer vision.

The hardware and software used to create and train machine learning algorithms are the foundations upon which artificial intelligence rests. AI systems generally work by ingestion of large amounts of labeled data.

They look for regularities in the information and extrapolate from that to anticipate potential outcomes. A chatbot, for instance, can be taught how to engage in natural-sounding conversation with humans by being exposed to actual textual exchanges between humans.

An image recognition tool can also learn how to recognize objects in images by being exposed to millions of images. AI programming is focused on three cognitive skills: reasoning, learning, and self-correction.

* Distinctive Forms of Artificial Intelligence

1. Weak AI or Narrow AI

  • Narrow AI is a type of AI that can perform a dedicated task with intelligence.
  • The most common and currently available AI is Narrow AI in Artificial Intelligence.
  • Narrow AI cannot perform beyond its field or limitations, as it is only trained for one specific task. Because of this, it is also known as “weak AI.” When stretched too far, narrow AI can fail in unexpected ways.
  • Apple Siri is a good example of Narrow AI, but it operates with a limited pre-defined range of functions.
  • Narrow AI also includes IBM’s Watson supercomputer because it employs an Expert system approach in addition to Machine learning and natural language processing.
  • Playing chess, making product recommendations on an online store, autonomous vehicles, speech recognition, and image recognition are all examples of Narrow AI.

2. Strong AI or General AI

  • Strong artificial intelligence allows systems to mimic human performance on various tasks.
  • Compared to older systems, these newer ones are more intricate and difficult to understand.
  • These programs are designed to operate independently of human input.
  • Strong AI can be seen in applications such as driverless cars and surgical suites.

* Layers of Web 3 Intelligence

1. Adaptive Blockchains

Blockchain concentrates on creating computing components for the decentralized functioning of financial transactions. These components, like oracles, consensus mechanisms, node applications, virtual machines, and distributed ledgers, perform a crucial role.

Traditional software infrastructure components, such as data storage and communication, are catching up quickly. The next blockchains’ core and sidechains will include machine learning features. It is possible to design a scalable consensus protocol by using transaction prediction.

2. Smart Protocols

The Web 3 stack, including smart contracts and protocols, will begin incorporating ML features soon. It looks like DeFi is the standard bearer for this movement. The next generation of DeFi AMMs and lending protocols will soon include smarter logic based on ML models.

For example, we can conceive of a lending protocol that employs some smart score to ensure that loans from all kinds of wallets are equally distributed.

3. Superior dApps

Web3 development solutions that allow for the rapid addition of ML-driven features are likely to include decentralized applications (dApps). There is already evidence of this trend in NFTs, which will only increase.

Next-generation NFTs will move from static images to artifacts with intelligent behavior. These NFTs can modify their actions depending on the owner’s emotional state.

* Why Artificial Intelligence in web3?

In web3, we are expanding AI’s abilities to benefit everyone, not just the rich. Each AI model is honed with the creator’s unique experiences, interests, and insights.

In web3, creators fully control their data, AI models, and digital assets.

As a result of AI’s proliferation in web3, a new creator economy is emerging in which communities can finance both the artists they admire and the AIs that improve their daily lives. Creators now have the opportunity to build a sustainable business around their creativity, and the community can benefit from this success.

* Final Words

Future technologies will likely include improvements to ArtificiaI Intelligence in web3. Over the past decade, the rapid advancement of ML technology and research has resulted in an overwhelming amount of ML platforms, frameworks, and APIs that can provide intelligent capabilities to web3 solutions. Already, we are seeing some instances of intelligence in web3 apps. We can say that web3 is brilliant, but this intelligence is not uniformly distributed.

Get Acquainted With Onshore Salesforce Development Services

Get Acquainted With Onshore Salesforce Development Services

Quick Summary: To expand your business you need to serve and retain your customers rightly. Salesforce is a wonderful Customer Relationship Management Software that engages your customers for you and automates several ubiquitous tasks. This article is a brief guide on the types of Salesforce Development Services that are available in the market. Once you know all, it will be easy for you to hire the perfect-fit Salesforce Development Company for your project.


A successful enterprise pertains its stature by maintaining its bond and relationships with its valuable customers. These bondings and relationships go beyond the business-level; they are interpersonal. Your customers direct your business and they serve you the purpose. A Customer Relationship Management software leads your company to esteemed heights.

Enhanced communication, better information organization, task automation, better customer service, improved efficiency, and amplified analytical data reporting are the core benefits of implementing a CRM platform for your organization.

It often happens that you get confused in choosing the right Salesforce partner for your project. Isn’t it? You look for experienced and certified Salesforce developers. But most of the time, you fail to check what types of Salesforce development services they provide. It might happen that your hired Salesforce development company doesn’t provide the service that you are looking for.

Hence, it is essential that you must know about the different types of Salesforce development services. Here, we have mentioned all the types of Salesforce development services that should be provided by the company you hire for your project. These services are often used and the most-preferred worldwide by many trusted and reputed clients for their business.

List of Salesforce Development Services

Salesforce Consulting Services

Salesforce CRM consulting services can help you increase ROI and sales, boost productivity, and improve your customer service. Those services include,

  • Salesforce Implementation

Leverage Salesforce implementation service and plan your workflow in the most efficient way as per your business needs.

  • Salesforce Integration consulting

Hire certified Salesforce developers with the right knowledge in providing all kinds of Salesforce development services. Use  top-most Salesforce integration consulting service and integrate various software, APIs, Plugins, and more.

  • Salesforce app consultants

Hire Salesforce app consultants and get best-in-class consultancy for building custom Salesforce appexchange apps for your business.

  • Salesforce cloud technology consultancy

Adopt Salesforce cloud technology consulting services and expand your business easily and quickly with the help of expert Salesforce developers.

  • Salesforce cloud crisis management consultancy

Want an error-free system and get rid of crises and glitches? Hire Salesforce consulting experts for your Salesforce and get rid of all the complex problems.

  • Salesforce cloud migration services

Migrate from traditional to latest CRM smoothly and seamlessly without any data loss using Salesforce cloud consultant’s expertise. Salesforce developers always stay updated with the latest tools and technologies.

Salesforce Customization Services

Intellectual Salesforce customization services can empower your business with the right solution by increasing tangible revenue, productivity, sales, marketing, and customer service teams. Our services include,

  • Add, manage and modify custom objects and fields

Improve your business’s ROI by adding, managing, and modifying custom objects to extend your custom object and fields’ functionality. Leverage Salesforce customization services and expect the best outcome!

  • Salesforce workflow automation

Certified Salesforce developers use the latest tools and technologies like workflow rule, process builder, and apex code to customize your existing CRM for simplifying CRM tasks.

  • Use of bulk API to configure the data loader

Hire Salesforce consultants and streamline your business processes using bulk API with custom Salesforce solutions.

  • Create custom reports and dashboards

Leverage top-of-the-line expertise in providing Salesforce customization services and create customized reports and dashboards that can help you identify the sales territory is the best or not, customer segment is profitable or not and much more.

  • Custom email templates

Create custom email templates, style sheets, and email attachments using Salesforce customization services as per your business needs.

Salesforce CRM integration with third-party systems

Salesforce developers have expertise in integrating Salesforce CRM with the third-party systems using REST/SOAP. Hire Salesforce developers and experience seamless data flow with our services.

  • Salesforce Integration Services

Leverage superior Salesforce Integration services and integrate your Salesforce with all the 3rd party software. Those services include,

  • Direct integration through APIs

Get in touch with one of the best Salesforce development partner and integrate solutions or web apps with Salesforce through API. Their Salesforce experts have top-of-the-line expertise in understanding Salesforce API based Integrations.

  • Integration through web services

Hire  talented Salesforce Integration experts to create real-time integration with Salesforce through web services and APIs. Get in touch with the best development company and develop Salesforce solutions through visual force or

Moreover, They can help you in utilizing the potential of Salesforce and its capabilities to your business. Be it accounting, ERP, ITSM, Email, Ecommerce, Marketing, Social media, or CTI, Their team of developers can deliver successful Salesforce Integration.


Salesforce Appexchange Services

Top-notch Salesforce development companies have provided successful Salesforce AppExchange development solutions to many enterprises using expertise in Salesforce AppExchange services. Those services include,

  • Appexchange app planning

Get end-to-end Salesforce AppExchange development services right from making a blueprint to prototype from skilled and experienced Salesforce AppExchange developers.

  • Appexchange app development

Develop the Salesforce Appexchange app with proper implementation right from scratch to the end using high-quality Salesforce AppExchange services.

  • Appexchange security review assistance

Salesforce Appexchange app developers have in-depth knowledge of maintaining all security protocols for security review. Hire experts and pass a review conducted by the developers of

  • Appexchange Migration

Migrate your existing app built-in Salesforce1 or lightning to the latest one easily and hassle-free using  Salesforce developer’s expertise.


Salesforce Data Migration Services(From Classic to Lightning)

Leverage the expertise in Salesforce data migration services and expert Salesforce developers will help you migrate from Salesforce classic to lightning hassle-free, faster, and in a cost-effective manner.

  • Lightning process automation

Create emails, tasks, and new records by extending processes and deploying workflows in every device. And,  Salesforce developers are capable of doing so. Leverage Salesforce lightning services and streamline your business processes to automation.

  • Component development

Leading Salesforce development companies back in USA, Canada Australia have expertise in providing best-in-class lightning component design and development services. Build reusable lightning components with the help of their skilled and experienced Salesforce developers and take your business to the next level!

  • Cloud Integration app development(Lightning connect)

Manage data and external application by building a cloud integration app using  Salesforce developer’s expertise. Seasoned developers might have done a lot real-time integration with external data sources for our clients.

  • Lightning consulting services

Top-notch Salesforce consulting company provides high-quality lightning consulting services to bring Salesforce’s real value to your business. Leverage their developer’s expertise and make your business’s tasks more potential and easy.

In fact, there is another popular services you might want to know- Salesforce Managed Services that include strategic planning and backlog management, Salesforce optimization, development operations, data management & cleansing and many more.

Apart from the mentioned Salesforce development Services, you should know that companies can also help you in customizing Salesforce products such as,

  • Sales cloud
  • Marketing cloud
  • Commerce cloud
  • Service cloud
  • App cloud
  • Community cloud
  • Health cloud
  • Financial services cloud and more.

Not only this, talented Salesforce developers have experience in providing the expertise of They provide services like development, integration, migration, and lightning components.


Leveraging top-of-the-line expertise in Salesforce development can help you solve the challenges of your B2B and B2C business. No matter what industry you are into,  Salesforce experts can help turn your dream project into reality. It is assured that experts have worked with diverse industries like Medical, Education, Finance, Lifestyle, Food & Drink, Shopping, Music, Travel, News, Entertainment, Social networking, Health & Fitness, Sports, and more.