Silicate Gel Sample Clauses

Silicate Gel. UTCHEM was modified to simulate the gel reaction of the silicate gel. Polymer and chromium were replaced with silicate (SiO2) and hydroxyl ion (OH-), respectively. The gelation was limited to occur only for pH > 7 (Xxxxxxx et al., 1988; Xxxx, 1979) to eliminate complex behavior of gel reaction rate at pH < 7, and the aqueous-phase permeability-reduction factor was independent of silicate viscosity. Silicate gel is formed by polymerization when appropriate conditions are established. The exact mechanism of gelation is not clear yet; several authors (Xxxx, 1979; Xxxxxxx et al., 1989) explain the general mechanism of gelations of various types of gels. The general process of gelation is as follows (Xxxxxxx et al., 1989): • condensation of monomer and dimer silicate species to form higher-order oligomers, • intramolecular condensation of silanol groups within polymers leading to ring closure and eventual particle formation, and • aggregation of individual particles to form chains and microgel. The rate of gelation (Xxxxxxxxxx et al., 1993) is a function of • silicate concentration • pH • ionic strength • temperature The basic equations that govern polymerization of silicate (Xxxx, 1979) are as follows: SiO2 + 2 H2O = Si(OH)4 (6.10) - SiOH + HOSi - = - SiOSi - + H2O (6.11) In general form, (nx-z) n SiO2 + z OH- = XxxXx(OH)z- + (y-2) H2O , (6.12) where n = degree of polymerization x = ratio of OH:Si x = 4.85 n- 1/3 - 7.8 n- 2/3 + 4.2 n- 1 2 y = 4 n - n x + z z = number of charges on polymer Equation 6.12 can be written in simplified form as [SiO2] + m [OH-] = [silicate gel] , (6.13) where m is the stoichiometric ratio.
AutoNDA by SimpleDocs

Related to Silicate Gel

  • Influenza Vaccination The parties agree that influenza vaccinations may be beneficial for patients and employees. Upon a recommendation pertaining to a facility or a specifically designated area(s) thereof from the Medical Officer of Health or in compliance with applicable provincial legislation, the following rules will apply:

  • Safety Glasses 10.3.1 Where a teacher is considered to be working in an “eye danger” area, the teacher shall receive a personal issue of standard neutral safety glasses which shall remain the property of the employer.

  • Influenza Vaccine Upon recommendation of the Medical Officer of Health, all employees shall be required, on an annual basis to be vaccinated and or to take antiviral medication for influenza. If the costs of such medication are not covered by some other sources, the Employer will pay the cost for such medication. If the employee fails to take the required medication, she may be placed on an unpaid leave of absence during any influenza outbreak in the home until such time as the employee has been cleared by the public health or the Employer to return to the work environment. The only exception to this would be employees for whom taking the medication will result in the employee being physically ill to the extent that she cannot attend work. Upon written direction from the employee’s physician of such medical condition in consultation with the Employer’s physician, (if requested), the employee will be permitted to access their sick bank, if any, during any outbreak period. If there is a dispute between the physicians, the employee will be placed on unpaid leave. If the employee gets sick as a reaction to the drug and applies for WSIB the Employer will not oppose the application. If an employee is pregnant and her physician believes the pregnancy could be in jeopardy as a result of the influenza inoculation and/or the antiviral medication she shall be eligible for sick leave in circumstances where she is not allowed to attend at work as a result of an outbreak. This clause shall be interpreted in a manner consistent with the Ontario Human Rights Code.

  • Infectious Disease Where an employee produces documentary evidence that:

  • Biological Samples If so specified in the Protocol, Institution and Principal Investigator may collect and provide to Sponsor or its designee Biological Samples (“Biological Samples”). 12.2.

  • Material Safety Data Sheet Seller shall provide to Buyer with each delivery any Material Safety Data Sheet applicable to the work in conformance with and containing such information as required by the Occupational Safety and Health Act of 1970 and regulations promulgated thereunder or its State approved counterpart.

  • Infectious Diseases The Employer and the Union desire to arrest the spread of infectious diseases in the nursing home. To achieve this objective, the Joint Health and Safety Committee may review and offer input into infection control programs and protocols including surveillance, outbreak control, isolation, precautions, worker education and training, and personal protective equipment. The Employer will provide training and ongoing education in communicable disease recognition, use of personal protective equipment, decontamination of equipment, and disposal of hazardous waste.

  • PRODUCT MANUFACTURER'S SUPPLIERS Only those dealers/distributors listed by the manufacturer will be considered authorized to act on behalf of the Product Manufacturer.

  • Product ACCEPTANCE Unless otherwise provided by mutual agreement of the Authorized User and the Contractor, Authorized User(s) shall have thirty (30) days from the date of delivery to accept hardware products and sixty (60) days from the date of delivery to accept all other Product. Where the Contractor is responsible for installation, acceptance shall be from completion of installation. Failure to provide notice of acceptance or rejection or a deficiency statement to the Contractor by the end of the period provided for under this clause constitutes acceptance by the Authorized User(s) as of the expiration of that period. The License Term shall be extended by the time periods allowed for trial use, testing and acceptance unless the Commissioner or Authorized User agrees to accept the Product at completion of trial use. Unless otherwise provided by mutual agreement of the Authorized User and the Contractor, Authorized User shall have the option to run testing on the Product prior to acceptance, such tests and data sets to be specified by User. Where using its own data or tests, Authorized User must have the tests or representative set of data available upon delivery. This demonstration will take the form of a documented installation test, capable of observation by the Authorized User, and shall be made part of the Contractor’s standard documentation. The test data shall remain accessible to the Authorized User after completion of the test. In the event that the documented installation test cannot be completed successfully within the specified acceptance period, and the Contractor or Product is responsible for the delay, Authorized User shall have the option to cancel the order in whole or in part, or to extend the testing period for an additional thirty (30) day increment. Authorized User shall notify Contractor of acceptance upon successful completion of the documented installation test. Such cancellation shall not give rise to any cause of action against the Authorized User for damages, loss of profits, expenses, or other remuneration of any kind. If the Authorized User elects to provide a deficiency statement specifying how the Product fails to meet the specifications within the testing period, Contractor shall have thirty (30) days to correct the deficiency, and the Authorized User shall have an additional sixty (60) days to evaluate the Product as provided herein. If the Product does not meet the specifications at the end of the extended testing period, Authorized User, upon prior written notice to Contractor, may then reject the Product and return all defective Product to Contractor, and Contractor shall refund any monies paid by the Authorized User to Contractor therefor. Costs and liabilities associated with a failure of the Product to perform in accordance with the functionality tests or product specifications during the acceptance period shall be borne fully by Contractor to the extent that said costs or liabilities shall not have been caused by negligent or willful acts or omissions of the Authorized User’s agents or employees. Said costs shall be limited to the amounts set forth in the Limitation of Liability Clause for any liability for costs incurred at the direction or recommendation of Contractor.

  • Asbestos Any material that contains more than one percent asbestos and is friable or is releasing asbestos fibers into the air above current action levels established by the United States Occupational Safety and Health Administration.

Time is Money Join Law Insider Premium to draft better contracts faster.