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What Are the Limitations of Radius Ratio Rule

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How well does this model work? Consider the structures of quadrivalent metal oxides (MO2), using Pauling`s rays and the predictions of the radius ratio model: For the two larger anions (S2 and Se2-), the dimensions of the unit cells are the same for both cations. This suggests that the anions of these structures are in contact. From a geometric point of view, the anion radius in this case is obtained by: Table 3138. Summary of cation-anion radius ratios (r+/r-) for different coordination numbers (CN). According to the radius ratio rule, we have: i) As the size (radius of ions) of a cation increases, more anions of a certain size can get carried around it. (ii) For a given structure, the limit radius ratio may be calculated. The limit radius ratio is the minimum permissible value for the ratio of ionic rays (ρ=r+/r-) for this structure to be stable. Here, r+ is the radius of the cation and r- is the radius of the surrounding anions. Note that anions are usually larger than cations. Note that the cations have different radii depending on the number of coordinations and therefore different radius ratios are calculated for Ge4+ with coordination numbers 4 and 6 and for Zr4+ with coordination numbers 6 and 8.

Figure 3138c. Example of atomic configurations when the size of the cation decreases. The basic idea of radius ratio rules is shown on the right. We assume that the anion is the packing atom in the crystal and that the smallest cation fills the interstitial sites (“holes”). Cations find arrangements in which they can come into contact with the greatest number of anions. If the cation can touch all the anions of its nearest neighbor, as shown on the right for a small cation in contact with larger anions, then the fit is good. If the cation is too small for a particular location, this coordination number is unstable and prefers a lower coordination structure. The following table shows the ranges of cations/anionic radius ratios that are best suited for a particular coordination geometry. In addition to the radius ratio rule, Linus Pauling has developed other useful rules that are useful for rationalizing and predicting the structures of inorganic compounds. Pauling`s rules[1] indicate: Figure 3138d. Comparisons between the real naCl and CsCl structures and their predictions according to the rules of radius ratios (r+/r). Early crystallographers struggled to solve the structures of inorganic solids using X-ray diffraction because some of the mathematical tools for analyzing data had not yet been developed.

Once an experimental structure was proposed, it was relatively easy to calculate the diffraction model, but it was difficult to go the other way (from the diffraction model to the structure) if a priori nothing was known about the arrangement of the atoms in the unit cell. It was (and still is!) important to develop guidelines for guessing the coordination numbers and bonding geometries of atoms in crystals. The first rules of this type were proposed by Linus Pauling, who thought about how to pack balls loaded with different rays together. Pauling suggested from geometric considerations that the quality of the fit depended on the radius ratio of the anion and the cation. As the size of the coordinated cation continues to decrease, it becomes too small to touch the surrounding anions because there is a limit radius ratio when the r+/r- becomes too small, as shown in Figure 3138c. Based on The Pythagorean Theorem, Figure 3138c(b), ρ = r+/r- = 0.732 ————————————- [3138] As we will soon see, all Pauling`s rules are justified on the basis of network energy considerations. In ionic compounds, the arrangement of atoms that maximizes anion-cation interactions while minimizing cation-cation and anion-anion contacts is energetically best. What about alkaline halides NaCl, KBr, LiI, CsF, etc.? All have the NaCl structure, with the exception of CsCl, CsBr and CsI, which have the CsCl (8-8) structure. In this case, the radius ratio model fails quite strongly. Li+ LiBr and LiI salts should have tetrahedral structures, and KF should have an 8-8 structure such as CsCl. We can try to adjust the rays (for example, . B, enlarge cations and reduce anions), but the best thing we can do with alkaline halides is to correctly predict about half of their structures.

Since alkaline halides are clearly ionic compounds, this failure suggests that something is wrong with the radius ratio model and that its success with MO2 compounds was random. We can construct a table of ionic rays assuming that the bond length is the sum of the rays (r + r-) when the crystal ions are in contact. Consider, for example, the compounds MgX and MnX, where X = O, S, Se. All these compounds crystallize in the NaCl structure: when two oppositely charged ions are joined together in solids, the bond length (d) is the sum of the two rays (r+ and r-) of the two different ions, as shown in Figure 3138a. Therefore, we can have d = r + r-. Then, a further decrease in the size of the cations causes the structure to increase to 6 times the coordination. For this series of oxides, the model seems to work quite well. The correct coordination number is predicted in all cases, and borderline cases such as GeO2 and ZrO2 are found in structures with different coordination numbers. .

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World Bank O&m Agreement

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At the national level, many countries have developed model tender documents, model contracts or important contractual clauses, as well as guidelines. These include a number of jurisdictions with extensive PPP programmes, such as the United Kingdom, Australia and South Africa. Standardized agreements are also increasingly being used for specific industries to reduce the cost of each individual contract. Other countries incorporate certain standardized elements into general legislation to regulate all PPP contracts. The purpose of this checklist is to identify key areas to consider when reviewing and drafting an operations and maintenance contract where the contract is a stand-alone agreement (i.e. the operator enters into a contract directly with the grantor) and is not part of a concession agreement where the concessionaire`s obligations are assigned to an operator during the period of operation. The term “PPP contract” refers to the contractual documents that govern the relationship between the public and private parties in connection with a PPP transaction. These documents define the rights and obligations of the parties, address risk allocation and change management mechanisms. In practice, the “PPP contract” can include several documents and agreements. For more details, see Box 3.9: “What is the PPP contract” (p. 155) of the PPP Reference Manual? There is a long tradition of using standardized agreements to purchase goods and services for traditional public works projects, and many international financial institutions, including the World Bank, require the use of standard tender documents for the projects they fund. The use of standardized contracts for complex public-private partnership (PPP) transactions is less common and international financial institutions have not yet created standardized agreements for PPP transactions.

For a summary of each type of agreement and model agreement, see: Contracts for Operations and Maintenance Contracts. The headings of the terms of this Agreement are provided for convenience only and will not be taken into account when interpreting or modifying the terms of this Agreement (42 pages). Below you will find links to examples of standardised PPP agreements, PPP contractual clauses, tender documents and guides developed at national and international level: Keywords: legal framework, contract, legal issues, model contract, model agreement, sample clauses, water, operation and maintenance Below you will also find checklists for agreements/sectors and examples of clauses: * Note: Although the main characteristics of each category in summary, there is overlap between the categories, and the name given to a particular agreement may not reflect this classic categorization. It is also necessary to determine whether a particular classification is enshrined in the laws of the host country, as in the case of many civil courts where there are strict definitions of “concessions” and “leases”. The examples of agreements in this section are not the full range of agreements related to infrastructure projects. Your agreements are NOT intended to be used as “templates”. When preparing and drafting an agreement, legal advice should be sought to ensure that it is appropriate and feasible in the circumstances of a particular project, sector and country. The terms and conditions of this website can be found under About PPPLRC. Public-private partnerships (PPPs) have a wide range of forms that differ in terms of the level of participation and risk taken by the private party.

The terms of a PPP are usually set out in a contract or agreement to describe each party`s responsibilities and clearly map the risk. The following graph shows the range of PPP agreements*. The Government of India`s Planning Commission provides an overview of model concession contracts for PPPs for a number of transport-related projects. Benchmarking period (clause 5) – particularly useful when data or asset records are not available or reliable prior to the conclusion of the contract Public-Private Partnerships Reference Guide, version: 2.0, Asian Development Bank (ADB), Inter-American Development Bank (IDB), World Bank Group, Public-Private Infrastructure Advisory Facility (PPIAF), Second Edition, July 2014, Table 3.1 “Examples of Standard PPP Contracts and Contractual Clauses,” p. 158. Clear provisions on changes in circumstances and variations (clause 20) Provisions that may not be recommended to be repeated / may require further examination: Initial benchmarking period provided at the beginning of the contract to review the figures relating to the performance of the public service and the quality of assets, which are the benchmark for performance and improvements under the contract. THIS DOCUMENT HAS BEEN PREPARED FOR THE PPP LEGAL RESOURCE CENTER FOR CONTRACTS, LAWS AND REGULATIONS (PPPLRC). THIS IS ONLY A CHECKLIST FOR GENERAL GUIDANCE PURPOSES AND SHOULD NOT BE USED AS A SUBSTITUTE FOR PROJECT-SPECIFIC LEGAL ADVICE. . Revised report on the recommended provisions of PPP treaties prepared by Gide Loyrette Nouel at the request of the World Bank, July 2015. Significant investments are needed to improve assets, reduce leaks and increase frequency (with the 24/7 target) Circumstances in which this contract may be appropriate: Performance-based fees associated with reducing the utility deficit each year (through reduced leakage and non-revenue-generating connections, higher revenues through better bill collection and higher rates) Many financial institutions, including the World Bank, have standardized documentation for public procurement of goods and services.

For more information, see Procurement Process and Quotation Documents. Title: Checklist for operation and maintenance contracts (autonomous) The operator paid a fixed fee + a performance-based fee + a percentage of the work for the management of the plant plan and works. Draft report on the recommended provisions of the PPP Treaty Restructuring, corporatisation and decentralisation Dispute settlement – the contract provides for negotiation, mediation and arbitration. For more related information, see PPP Checklist and Risk Matrix Disclaimer: Resources on this site are typically managed by third-party websites. The World Bank assumes no responsibility for the accuracy, completeness, or quality of the information provided or incorrect links or misplaced resources. Any changes to the website or underlying link may result in changes to the PPPLRC`s analysis and recommendations. The inclusion of materials on this website should not be construed as an obligation to provide funding or as an endorsement by the World Bank of the quality of the document or project. If you have any comments on any of the links provided on the PPPLRC, please contact Joint Ventures and Partial Divestiture of Public Assets Full Divestiture Operator here to manage and perform capital works in accordance with an agreed capital asset processing program.

The checklist should also be useful in identifying areas that have not been addressed or that require further attention. Title: Water and Wastewater Operation and Maintenance Contract (Example 1) When the owner is willing to give the operator a lot of responsibility in exchange for system improvements. O&M Contract Checklist1.27 MB, Operations and Maintenance Contract Checklist766.57 KB. Medium-term involvement (7 to 15 years) of a private operator in the operation and maintenance of a municipal water [and wastewater] system where the owner seeks to improve service delivery and quality (with the aim of 24/7 water service), as well as a reduction in losses and deficits. . . .

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Will Spectrum Mobile Buyout My Verizon Contract

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The whole family uses your internet service at home. So why shouldn`t everyone be on the same mobile service? You can add your spouse, children, siblings, and other family members to your Spectrum Mobile plan. Spectrum Mobile and Verizon offer similar services through their shared 4G LTE network, but they are not identical. Instead, in addition to its cellular service, Spectrum uses a network of nearly 500,000 data access points to help you stay on Wi-Fi instead of 4G LTE. This should help you control your data usage and, in turn, save you some money on your By the Gig plan. For these users, the use of the mobile hotspot is also included in the 20 GB or 30 GB of monthly broadband data. The plan gives you unlimited conversations and texts, truly unlimited data (with no caps), access to tons of high-speed Wi-Fi hotspots, free international calls and TEXT messages to specific locations, and access to mobile hotspots. It`s like two scoops of ice cream with all the toppings. Spectrum Mobile now offers an Unlimited Plus plan for an extra $10 per month with two or more lines if you want to work with it a little more. It brings your streaming to HD quality, and you have 30GB of premium data.

Otherwise, a single line of Unlimited will cost $45 and Unlimited Plus will cost you $55. Spectrum Mobile doesn`t actually have its own mobile network. Instead, it uses Verizon Wireless` cell towers to power its cellular service. This is good news for Spectrum Mobile customers. You must opt for the bundled services of Spectrum Cable, Spectrum Internet and Voice to be eligible for the contract buyback option. Spectrum offers the contract redemption option for Spectrum Triple Play and Double Play customers (in select areas). The answer to mobile spectrum buyback contracts is unfortunately no! In short, here`s what you need to do to get the contract buyback setup: Even if you`re eligible for the service, you should consider whether you want your cellular plan to be linked to your home internet plan. The mobile hotspot is also available to By the Gig users, but if you use it frequently, it will result in a higher bill as you will still be using data when the mobile hotspot feature is enabled. To watch videos in HD quality without using your mobile data, you can connect to Wi-Fi at any time. Spectrum Mobile uses Verizon`s network to provide coverage.

Luckily for Spectrum mobile users, Verizon is the best network in the country, covering 70% of the country. Check out Verizon Wireless` coverage map to see where you can get great Spectrum Mobile service. If you cancel your Internet subscription and want to continue maintaining your cellular service, you will be charged an additional $20 per month per line, and your Wi-Fi speeds will be reduced to 5 Mbps. Yuck. For By the Gig users, mobile hotspot speeds are reduced to 256 Kbps after 5 GB per billing cycle. Many discount providers and mobile virtual network (MVNO) providers, such as Spectrum Mobile, save on discounts. But Spectrum actually offers its customers decent extra benefits. So why should you get cellular service from your ISP? Here are some good reasons.

Spectrum purchase applies to customers who order a Triple Play plan or, in some cases, a Double Play plan (contact Spectrum Customer Service for more information). You must submit a completed Spectrum Contract Redemption Form with a copy of the final invoice you received from your last provider, clearly indicating the early cancellation fee. If there is no early cancellation fee on your invoice, ask your supplier to send you a personalized invoice. Spectrum`s purchase of the contract applies only to cable television services when registering for television, Internet and home telephone. It does not apply to Spectrum Mobile. For those who want to upgrade to Spectrum Mobile, Spectrum unfortunately doesn`t offer a contract buyback at the moment, but if you order a triple play plan with Spectrum Internet, as well as an active credit card with a good credit score, you can easily sign up for the amazing Spectrum Mobile service. However, you will have to bear all the unpaid costs for mobile phones and connections from your old provider. .

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Who Should Sign a Settlement Agreement First

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Not yet, there is still much to be done. Long gone are the good old days when a “handshake between gentlemen” was enough to seal a binding agreement forever that would never be revoked under the threat of death or, worse, shame. As advocates of legal error, we see an increase in the number of cases resulting from lateral comparisons. These lead to dissatisfied clients with a worse outcome or to additional litigation for which the client tries to hold their lawyer accountable. In some cases, settlements actually lead to subsequent litigation. There is an old saying that says, “A meagre agreement is better than a fat judgment.” If this is true, you need to make sure that the agreement is effective and enforceable. So here`s a list of gaps with a few things to keep in mind when commemorating your settlement before opening a bottle. The first thing to remember is that this happens frequently. Nothing is binding until the agreement has been agreed and signed by you. In Provost, Carolyn Yee, the regents` in-house lawyer, signed the agreement because she had been appointed as the party`s representative. She was an employee of the university and, according to the court, was appointed as a representative of the company authorized to represent the company. Ms. Yee was not a lawyer for the complaint.

She was a registered lawyer on the cross-appeal. The court stressed that this did not prevent him from signing as a representative of the company. The settlement agreement was confirmed enforceable because it had been signed by the defendant “party”. You should also understand the legal requirements of this type of contract. For a settlement agreement to be valid, it must be in writing and contain the following: The judge has also not yet determined the “fees”. I am the plaintiff in a bodily injury case and I lost the case despite very good medical evidence. The judge still allows observations on “costs”, but the judge says in the decision: “Costs to the defendant (if requested). I have now asked the defendant whether she will claim costs. My question: Is there still room for a “settlement” if the “costs” issue has not yet been decided? My first book, “The Evolution of Professional Football,” is available on Amazon and www.SterlingMillerBooks.com. • Neither party may contest a request for judgment under Article 664.6 of the Code of Civil Procedure under this Settlement Agreement on the basis that this Agreement is confidential or otherwise privileged. First, ask yourself if a settlement agreement is the best way to resolve your dispute.

This type of agreement requires one party to close a lawsuit or pay a certain amount in exchange for the other party`s promise to drop the lawsuit. Common situations that can be resolved with a settlement agreement include: If you and/or your husband have signed the agreement, the only way to change the terms is for the other party to accept the agreement. This means that you or your lawyer will need to contact them and ask them if they are willing to change the terms. If they agreed, I guess they would ask for a reduction in the total amount of billing in exchange for giving you a lump sum or agreeing to something else. I know this is probably not the answer you were looking for, but once you`ve signed a contract/agreement, it can usually only be changed with the consent of the other party. Once the financial aspect of the offer has been taken into account, try to negotiate upwards or reject the deal altogether. You can then focus on the other terms of the agreement, which will be numerous. Hello, towards the end of a settlement.

The settlement was a price we had agreed for a non-compete clause with a former employee. The second question about the scope of published claims is whether claims are simply dismissed or dismissed with “prejudice”. If applications are simply rejected, they can be resubmitted. If applications are rejected with prejudice, they are completely extinguished and cannot be resubmitted by the applicant. In general, the parties reject claims with prejudice in a settlement agreement because they want the dispute to be resolved 100%. Whether this happens or not depends on what the parties have negotiated, whether the release is taken into account and other factors. Just think about the ones you want, and then make sure it`s in the settlement agreement. When you record a settlement, a summary of the points of comparison is provided to the judge, who reads them in the transcript to the court reporter. The judge then executes the parties to the settlement. The judge`s questions are: The danger to avoid: Too often, consultants record only the most important terms: Who pays who what, how and when.

The best intention is to ensure that the remaining issues are resolved between the parties in a formal settlement agreement at a later date. Since article 664.6 of the Code of Civil Procedure requires that settlements be subject to enforceability “in a document signed by the parties outside the presence of the court or orally in court”, oral agreements on these matters, or “agreements” that are not remembered, are simply insufficient for further enforcement action. The opportunity to create this binding mechanism must not be wasted. So you want a confidentiality agreement with a clause on lump sum damages? If it is not mentioned in court, you cannot force the other party to comply with it in order to include it in a later written version. 10. “Accidental” Settlement Agreement. If your answer to paragraph three above had been “Looks like we have an agreement.” vs. “Let me think about it,” you may have accidentally accepted a settlement offer that (a) you really didn`t want to accept and (b) you had no authority to accept it. This means that you need to be very careful when negotiating settlements, especially when exchanging drafts or term sheets via email, so as not to somehow create a binding settlement agreement that you wouldn`t have wanted to accept otherwise. Sometimes, in the frenzy of finding a solution to your dispute, you may give up your vigilance and become lazy with the language, or otherwise be aware of the conditions under which you will accept the basic settlement proposal from the other side. For example, you may be happy with the $400,000 in cash, but you`ll also need a biased layoff, an agreed media statement, a press release covering your affiliates, and a payment on a certain date to make finances happy.

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