Accounting Ch 3

Accounting Ch 3
Accounting Ch 3

CHAPTER 2

Financial Statements

and Analysis

INSTRUCTOR’S RESOURCES

Overview

This chapter examines the key components to the stockholders' report: the income statement, balance sheet, statement of retained earnings, and the statement of cash flows. On the income statement and balance sheet, the major accounts/balances are reviewed for the student. The rules for consolidating a company's foreign and domestic financial statements (FASB No. 52) are described. Following the financial statement coverage the chapter covers the evaluation of financial statements using the technique of ratio analysis. Ratio analysis is used by prospective shareholders, creditors, and the firm's own management to measure the firm's operating and financial health. Three types of comparative analysis are defined: cross-sectional analysis, time-series analysis, and combined analysis. The ratios are divided into five basic categories: liquidity, activity, debt, profitability, and market. Each ratio is defined and calculated using the financial statements of the Bartlett Company. A brief explanation of the implications of deviation from industry standard ratios is offered, with a complete (cross-sectional and time-series) ratio analysis of Bartlett Company ending the chapter. The DuPont system of analysis is also integrated into the example.

PMF Tutor: Financial Ratios

This section of the Gitman Tutor generates problems to give the student practice calculating liquidity, activity, debt, profitability, and market ratios.

PMF Problem-Solver: Financial Ratios

This module allows the student to compute all the financial ratios described in the text. There are three options: all ratios, families of ratios, and individual ratios.

Part 1 Introduction to Managerial Finance

PMF Templates

Spreadsheet templates are provided for the following problems: Problem Topic

Problem 2-4 Calculation of EPS and retained earnings Problem 2-5 Balance sheet preparation

Problem 2-6 Impact of net income on a firm’s balance sheet Problem 2-8 Statement of retained earnings

Problem 2-15 Debt analysis

Study Guide

Suggested Study Guide examples for classroom presentation: Example Topic

1 Basic ratio calculation

2 Common-size income statement

3 Evaluating ratios

Chapter 2 Financial Statements and Analysis ANSWERS TO REVIEW QUESTIONS

2-1 The purpose of each of the 4 major financial statements are:

Income Statement - The purpose of the income statement is to provide a financial summary of the firm’s operating results during a specified time period. It includes both the sales for the firm and the costs incurred in generating those sales. Other expenses, such as taxes, are also included on this statement.

Balance Sheet – The purpose of the balance sheet is to present a summary of the assets owned by the firm, the liabilities owed by the firm, and the net financial position of the owners as of a given point in time. The assets are often referred to as investments and the liabilities and owners equity as financing.

Statement of Retained Earnings - This statement reconciles the net income earned during the year, and any cash dividends paid, with the change in retained earnings during the year.

Statement of Cash Flows - This statement provides a summary of the cash inflows and the cash outflows experienced by the firm during the period of concern. The inflows and outflows are grouped into the cash flow areas of operations, investment, and financing.

2-2 The notes to the financial statements are important because they provide detailed information not directly available in the financial statements. The footnotes

provide information on accounting policies, procedures, calculation, and

transactions underlying entries in the financial statements.

2-3 Financial Accounting Standards Board Statement No. 52 describes the rules for consolidating a company's foreign and domestic financial statements. It requires U.S.-based companies to translate foreign-currency-denominated assets and liabilities into U.S. dollars using the current rate (translation) method. This method uses the exchange rate prevailing on the date the fiscal year ends (the current rate).

Income statement items can be translated using either the current rate or an average exchange rate for the period covered by the statement. Equity accounts are converted at the exchange rate on the date of the investment. In the retained earnings account any gains and losses from currency fluctuations are stated separately in an equity reserve account?the cumulative translation adjustment account?and not realized until the parent company sells or closes the foreign operations.

2-4Current and prospective shareholders place primary emphasis on the firm's current and future level of risk and return as measures of profitability, while creditors are more concerned with short-term liquidity measures of debt. Stockholders are, therefore, most interested in income statement measures, and creditors are most

Part 1 Introduction to Managerial Finance

concerned with balance sheet measures. Management is concerned with all ratio measures, since they recognize that stockholders and creditors must see good ratios in order to keep the stock price up and raise new funds.

2-5Cross-sectional comparisons are made by comparing similar ratios for firms within the same industry, or to an industry average, as of some point in time. Time-series

comparisons are made by comparing similar ratios for a firm measured at various points in time. Benchmarking is the term used to describe this cross-sectional comparison with competitor firms.

2-6The analyst should devote primary attention to any significant deviations from the norm, whether above or below. Positive deviations from the norm are not necessarily favorable. An above-normal inventory turnover ratio may indicate highly efficient inventory management but may also reveal excessively low inventory levels resulting in stockouts. Further examination into the deviation would be required.

2-7Comparing financial statements from different points in the year can result in inaccurate and misleading analysis due to the effects of seasonality. Levels of current assets can fluctuate significantly, depending on a company's business, so statements from the same month or year end should be used in the analysis to ensure valid comparisons of performance.

2-8The current ratio proves to be the better liquidity measure when all of the firm’s current assets are reasonably liquid. The quick ratios would prove to be the superior measure if the inventory of the firm is considered to lack the ability to be easily converted into cash.

2-9Additional information is necessary to assess how well a firm collects receivables and meets payables. The average collection period of receivables should be compared to a firm's own credit terms. The average payment period should be compared to the creditors' credit terms.

2-10Financial leverage is the term used to describe the magnification of risk and return introduced through the use of fixed-cost financing, such as debt and preferred stock.

2-11The debt ratio and the debt-equity ratio may be used to measure the firm's degree of indebtedness. The times-interest-earned and the fixed-payment coverage ratios can be used to assess the firm's ability to meet fixed payments associated with debt.

2-12Three ratios of profitability found on a common-size income statement are: (1) the gross profit margin, (2) the operating profit margin, and (3) the net profit margin.

2-13Firms that have high gross profit margins and low net profit margins have high levels of expenses other than cost of goods sold. In this case, the high expenses

Chapter 2 Financial Statements and Analysis more than compensate for the low cost of goods sold (i.e., high gross profit margin) thereby resulting in a low net profit margin.

2-14The owners are probably most interested in the Return on Equity (ROE) since it indicates the rate of return they earn on their investment in the firm. ROE is calculated by taking net profits after taxes and dividing by stockholders' equity.

2-15The price-earnings ratio(P/E)is the market price per share of common stock divided by the earnings per share. It indicates the amount the investor is willing to pay for each dollar of earnings. It is used to assess the owner's appraisal of the value of the firm's earnings. The level of the P/E ratio indicates the degree of confidence that investors have in the firm's future. The market/book (M/B) ratio is the market price per of common stock divided by the firm’s book value per share. Firms with high M/B ratios are expected to perform better than firms with lower relative M/B values.

2-16Liquidity ratios measure how well the firm can meet its current (short-term) obligations when they come due.

Activity ratios are used to measure the speed with which various accounts are converted (or could be converted) into cash or sales.

Debt ratios measure how much of the firm is financed with other people's money and the firm's ability to meet fixed charges.

Profitability ratios measure a firm's return with respect to sales, assets, or equity (overall performance).

Market ratios give insight into how well investors in the marketplace feel the firm is doing in terms of return and risk.

The liquidity and debt ratios are most important to present and prospective creditors.

2-17The analyst may approach a complete ratio analysis on either a cross-sectional or time-series basis by summarizing the ratios into their five key areas: liquidity, activity, debt, profitability, and market. Each of the key areas could then be summarized, highlighting specific ratios that should be investigated.

2-18The DuPont system of analysis combines profitability (the net profit margin), asset efficiency (the total asset turnover) and leverage (the debt ratio). The division of ROE among these three ratios allows the analyst to the segregate the specific factors

Part 1 Introduction to Managerial Finance

that are contributing to the ROE into profitability, asset efficiency, or the use of debt.

Chapter 2 Financial Statements and Analysis SOLUTIONS TO PROBLEMS

2-1LG 1: Reviewing Basic Financial Statements

Income statement: In this one-year summary of the firm's operations, Technica, Inc. showed a net profit for 2003 and the ability to pay cash dividends to its stockholders.

Balance sheet: The financial condition of Technica, Inc. at December 31, 2002 and 2003 is shown as a summary of assets and liabilities. Technica, Inc. has an excess of current assets over current liabilities, demonstrating liquidity. The firm's fixed assets represent over one-half of total assets ($270,000 of $408,300). The firm is financed by short-term debt, long-term debt, common stock, and retained earnings.

It appears that it repurchased 500 shares of common stock in 2003.

Statement of retained earnings: Technica, Inc. earned a net profit of $42,900 in 2003 and paid out $20,000 in cash dividends. The reconciliation of the retained earnings account from $50,200 to $73,100 shows the net amount ($22,900) retained by the firm.

2-2 LG 1: Financial Statement Account Identification

a. b.

Account Name Statement Type of Account

Accounts payable BS CL

Accounts receivable BS CA

Accruals BS CL

Accumulated depreciation BS FA*

Administrative expense IS E

Buildings BS FA

Cash BS CA

Common stock (at par) BS SE

Cost of goods sold IS E

Depreciation IS E

Equipment BS FA

General expense IS E

Interest expense IS E

Inventories BS CA

Land BS FA

Long-term debt BS LTD

Machinery BS FA

Marketable securities BS CA

Notes payable BS CL

Operating expense IS E

Paid-in capital in excess of par BS SE

a. b.

Part 1 Introduction to Managerial Finance

Account Name Statement Type of Account

Preferred stock BS SE

Preferred stock dividends IS E

Retained earnings BS SE

Sales revenue IS R

Selling expense IS E

Taxes IS E

Vehicles BS FA

* This is really not a fixed asset, but a charge against a fixed asset, better known as a contra-asset.

2-3 LG 1: Income Statement Preparation

a.

Cathy Chen, CPA

Income Statement

for the Year Ended December 31, 2003

Sales revenue $180,000

Less: Operating expenses

Salaries 90,000

Employment taxes and benefits 17,300

Supplies 5,200

Travel & entertainment 8,500

Lease payment 16,200

Depreciation expense 7,800

Total operating expense 145,000 Operating profits $ 35,000

Less: Interest expense 7,500

Net profits before taxes $ 27,500

Less: Taxes (30%) 8,250

Net profits after taxes $ 19,250 b.In her first year of business, Cathy Chen covered all her operating expenses and

earned a net profit of $19,250 on revenues of $180,000.

2-4 LG 1: Calculation of EPS and Retained Earnings

a. Earnings per share:

Net profit before taxes $218,000

Less: Taxes at 40% 87,200

Net profit after tax $130,800

Less: Preferred stock dividends 32,000

Earnings available to common stockholders $ 98,800

Earnings per share:

Chapter 2 Financial Statements and Analysis

162.1$000

,85800

,98$g outstandin shares T otal rs stockholde common to available Earning ==

b. Amount to retained earnings:

85,000 shares x $0.80 = $68,000 common stock dividends

Earnings available to common shareholders $98,800 Less: Common stock dividends 68,000 To retained earnings

$30,800

2-5

LG 1: Balance Sheet Preparation

Owen Davis Company

Balance Sheet December 31, 2003

Assets

Current assets:

Cash

$ 215,000

Marketable securities 75,000 Accounts receivable 450,000 Inventories 375,000 Total current assets $1,115,000 Gross fixed assets

Land and buildings

$ 325,000 Machinery and equipment 560,000 Furniture and fixtures 170,000 Vehicles

25,000 Total gross fixed assets

$1,080,000 Less: Accumulated depreciation 265,000 Net fixed assets $ 815,000 Total assets

$1,930,000

Liabilities and stockholders' equity Current liabilities:

Accounts payable $ 220,000 Notes payable 475,000 Accruals

55,000 Total current liabilities

$ 750,000 Long-term debt 420,000 Total liabilities $1,170,000

Stockholders' equity

Part 1 Introduction to Managerial Finance

Preferred stock

$ 100,000

Common stock (at par)

90,000 Paid-in capital in excess of par 360,000 Retained earnings 210,000 Total stockholders' equity

$ 760,000 Total liabilities and stockholders' equity

$1,930,000

2-6 LG 1: Impact of Net Income on a Firm's Balance Sheet Account Beginning Value

Change Ending Value a. Marketable securities $ 35,000 + $1,365,000 $1,400,000 Retained earnings $1,575,000 + $1,365,000

$2,940,000

b. Long-term debt $2,700,000 - $ 865,000 $1,835,000 Retained earnings $1,575,000 + $ 865,000

$2,440,000

c. Buildings $1,600,000 + $ 865,000 $2,465,000 Retained earnings $1,575,000 + $ 865,000

$2,440,000

d. No net change in any accounts

2-7 LG 1: Initial Sale Price of Common Stock

share

per 50.9$300,000$2,625,000

$225,000 price sales Initial g outstandin shares common of Number par) of excess in capital in Paid stock common of (Par value

price sales Initial =+=+

=

Chapter 2 Financial Statements and Analysis

2-8 LG 1: Statement of Retained Earnings

a. Cash dividends paid on common stock = Net profits after taxes - preferred

dividends - change in retained earnings

= $377,000 - $47,000 - (1,048,000 - $928,000) = $210,000

Hayes Enterprises

Statement of Retained Earnings for the Year Ended December 31, 2003

Retained earnings balance (January 1, 2003) $928,000 Plus: Net profits after taxes (for 2003) 377,000 Less: Cash dividends (paid during 2003)

Preferred stock (47,000) Common stock

(210,000) Retained earnings (December 31, 2003)

$1,048,000

b. g

outstandin shares common of Number (EACS*)

dividends Preferred -after tax profit Net =

share per Earnings

36.2$140,000

$47,000

- $377,000=

share per Earnings =

* Earnings available to common stockholders c. shares

#dividend

cash Total =

share per dividend Cash

50.1$140,000

a)

part (from $210,000=

share per dividend Cash =

2-9 LG 1: Changes in Stockholders' Equity

a. Net income for 2003 = change in retained earnings + dividends paid

Net income for 2003 = ($1,500,000 – $1,000,000) + $200,000 = $700,000 b. New shares issued = outstanding share 2003 – outstanding shares 2002 New shares issued = 1,500,000 – 500,000 = 1,000,000

Part 1 Introduction to Managerial Finance

c.

00

.5$1,000,000$1,000,000

$4,000,000price issuance Average g

outstandin shares stock

ommon C capital -in -Paid

price issuance Average =+=??+?=

d.

00

.2$500,000$500,000

$500,000price issuance Original issued

shares of Number stock

ommon C capital -in -Paid

price issuance riginal O =+=+=

2-10 LG 2, 3, 4, 5: Ratio Comparisons

a. The four companies are in very different industries. The operating characteristics of

firms across different industries vary significantly resulting in very different ratio values.

b. The explanation for the lower current and quick ratios most likely rests on the fact

that these two industries operate primarily on a cash basis. Their accounts receivable balances are going to be much lower than for the other two companies.

c. High level of debt can be maintained if the firm has a large, predictable, and steady

cash flow. Utilities tend to meet these cash flow requirements. The software firm will have very uncertain and changing cash flow. The software industry is subject to greater competition resulting in more volatile cash flow.

d. Although the software industry has potentially high profits and investment return

performance, it also has a large amount of uncertainty associated with the profits. Also, by placing all of the money in one stock, the benefits of reduced risk associated with diversification are lost.

2-11 LG 3: Liquidity Management a 2000 2001 2002 2003

Current Ratio 1.88 1.74 1.79 1.55 Quick Ratio 1.22 1.19 1.24 1.14 Net Working Capital $7,950 $9,300 $9,900 $9,600 b. The pattern indicates a deteriorating liquidity position. c. The low inventory turnover suggests that liquidity is even worse than the declining

liquidity measures indicate. Slow inventory turnover may indicate obsolete inventory.

Chapter 2 Financial Statements and Analysis 2-12 LG 3: Inventory Management

a.Sales $4,000,000 100%

Cost of Goods Sold ? 60%

Gross Profit $1,600,000 40%

CGS $2,400,000

Average Inventory = $650,000

Inventory Turnover = $2,400,000 ÷$650,000

Inventory Turnover = 3.69 times

Average Age of Inventory = 360 ÷ 3.69

Average Age of Inventory = 97.6 days

b.The Wilkins Manufacturing inventory turnover ratio significantly exceeds the

industry. Although this may represent efficient inventory management, it may also represent low inventory levels resulting in stockouts.

2-13 LG 3: Accounts Receivable Management

a.Average Collection Period = Accounts Receivable Average Sales per Day

45 Days = $300,000 ÷ ($2,400,000 ÷ 360)

Since the average age of receivables is 15 days beyond the net date, attention should be directed to accounts receivable management.

b.This may explain the lower turnover and higher average collection period. The

December accounts receivable balance of $300,000 may not be a good measure of the average accounts receivable, thereby causing the calculated average collection period to be overstated. It also suggests the November figure (0-30 days overdue) is not a cause for great concern. However, 13 percent of all accounts receivable (those arising in July, August and September) are sixty days or more overdue and may be a sign of poor receivables management.

2-14 LG 3: Interpreting Liquidity and Activity Ratios

a.Bluegrass appears to be holding excess inventory relative to the industry. This fact

is supported by the low inventory turnover and the low quick ratio, even though the current ratio is above the industry average. This excess inventory could be due to slow sales relative to production or possibly from carrying obsolete inventory.

Part 1 Introduction to Managerial Finance

b.The accounts receivable of Bluegrass appears to be high due to the large number of

days of sales outstanding (73 versus the industry average of 52 days). An important question for internal management is whether the company's credit policy is too lenient or customers are just paying slowly – or potentially not paying at all.

c.Since the firm is paying its accounts payable in 31 days versus the industry norm of

40 days, Bluegrass may not be taking full advantage of credit terms extended to

them by their suppliers. By having the receivables collection period over twice as long as the payables payment period, the firm is financing a significant amount of current assets, possibly from long-term sources.

d.The desire is that management will be able to curtail the level of inventory either by

reducing production or encouraging additional sales through a stronger sales program or discounts. If the inventory is obsolete, then it must be written off to gain the income tax benefit. The firm must also push to try to get their customers to pay earlier. Payment timing can be increased by shortening credit terms or providing a discount for earlier payment. Slowing down the payment of accounts payable would also reduce financing costs.

Carrying out these recommendations may be difficult because of the potential loss of customers due to stricter credit terms. The firm would also not want to increase their costs of purchases by delaying payment beyond any discount period given by their suppliers.

2-15 LG 4: Debt Analysis

Ratio Definition Calculation Creek Industry Debt Debt $36,500,000 .73 .51

Total Assets $50,000,000

Times EBIT $ 3,000,000 3.00 7.30

Interest Earned Interest $ 1,000,000

Fixed

Payment

Coverage

EBIT + Lease Payment $3,000,000 + $200,000 1.19 1.85

Interest + Lease Payments $1,000,000 + $200,000 +

+ {[(Principal + Preferred Stock {[($800,000 + $100,000)]

Dividends)] x [1÷ (1-t)]} x [1÷ (1-.4)]}

Because Creek Enterprises has a much higher degree of indebtedness and much

lower ability to service debt than the average firm in the industry, the loan should be rejected.

2-16 LG 5: Common-Size Statement Analysis

Chapter 2 Financial Statements and Analysis

Creek Enterprises

Common-Size Income Statement

for the Years Ended December 31, 2002 and 2003

2003 2002 Sales Revenue

100.0% 100.0% Less: Cost of goods sold 70.0% 65.9% Gross profits 30.0%

34.1%

Less: Operating expenses:

Selling 10.0% 12.7% General 6.0% 6.3% Lease expense .7% .6% Depreciation 3.3%

20.0% 3.6%

23.2% Operating profits

10.0% 10.9% Less: Interest expense

3.3% 1.5% Net Profits before taxes

6.7% 9.4% Less: Taxes

2.7%

3.8% Net profits after taxes

4.0%

5.6%

Sales have declined and cost of goods sold has increased as a percentage of sales, probably due to a loss of productive efficiency. Operating expenses have decreased as a percent of sales; this appears favorable unless this decline has contributed toward the fall in sales. The level of interest as a percentage of sales has increased significantly; this is verified by the high debt measures in problem 2-15 and suggests that the firm has too much debt.

Further analysis should be directed at the increased cost of goods sold and the high debt level.

2-17 LG 4, 5: The Relationship Between Financial leverage and Profitability a. (1)

%

5050.000

,000,10$000

,000,5$ratio Debt %1010.000,000,10$000

,000,1$ratio Debt assets total s

liabilitie total

ratio Debt Timberland Pelican =======

(2)

Part 1 Introduction to Managerial Finance

5

.12000,500$000

,250,6$earned interest T imes 5

.62000,100$000

,250,6$earned interest T imes interest

taxes

and interest before earning

earned interest T imes Timberland Pelican ===== Timberland has a much higher degree of financial leverage than does Pelican. As a

result Timberland's earnings will be more volatile, causing the common stock owners to face greater risk. This additional risk is supported by the significantly lower times interest earned ratio of Timberland. Pelican can face a very large reduction in net income and still be able to cover its interest expense. b.

(1)

%

2525.000,000,25$000

,250,6$margin profit Operating %2525.000,000,25$000

,250,6$margin profit Operating sales

profit

operating

margin profit Operating Timberland Pelican =======

(2)

%

80.13138.000,000,25$000

,450,3$margin profit Net %

76.141476.000,000,25$000

,690,3$margin profit Net sales

income

net

margin profit Net Timberland Pelican =======

(3)

%

5.34345.000,000,10$000

,450,3$assets on Return %

9.36369.000,000,10$000

,690,3$assets on Return assets total s

after taxe profit net

assets on Return Timberland Pelican =======

(4)

Chapter 2 Financial Statements and Analysis

%

0.6969.000,000,5$000

,450,3$equity on Return %

0.4141.000

,000,9$000

,690,3$equity on Return equity

rs stockholde s after taxe profit net

equity on Return Timberland Pelican =======

Pelican is more profitable than Timberland, as shown by the higher operating profit

margin, net profit margin, and return on assets. However, the return on equity for Timberland is higher than that of Pelican. (c)

Even though Pelican is more profitable, Timberland has a higher ROE than Pelican due to the additional financial leverage risk. The lower profits of Timberland are due to the fact that interest expense is deducted from EBIT. Timberland has $500,000 of interest expense to Pelican's $100,000. Even after the tax shield from the interest tax deduction ($500,000 x .40 = $200,000) Timberland's profits are less than Pelican's by $240,000. Since Timberland has a higher relative amount of debt, the stockholders' equity is proportionally reduced resulting in the higher return to equity than that obtained by Pelican. The higher ROE is at the expense of higher levels of financial risk faced by Timberland equity holders.

2-18 LG 6: Ratio Proficiency a.

$32,000,00 .8 0$40,000,00 profit Gross margin

profit gross sales profit Gross =?=?=

b.

$8,000,000

0$32,000,00 - 0$40,000,00 sold goods of Cost profit

gross - sales sold goods of Cost ===

c.

000

,000,14$35.000,000,40$profit Operating margin

profit operating sales profit Operating =?=?=

d.

$18,000,000$14,000,00-0$32,000,00expenses Operating profit

operating -profit gross expenses Operating ===

e.

$3,200,000 .08 0$40,000,00 margin profit net sales profit Net =?=?=

f.

Part 1 Introduction to Managerial Finance

0$20,000,00 2

$40,000,00 over asset turn total sales

assets Total ===

g.

16,000,000$.20

$3,200,000

ROE income net

equity Total ===

h.

104

,911,6$111,111$2.62360

$40,000,0062.2days receivable Accounts 365

sales

period collection average receivable Accounts =?=?

=?=

2-19 LG 6: Cross-Sectional Ratio Analysis a.

Fox Manufacturing Company

Ratio Analysis

Industry Average Actual 2003 2003

Current ratio 2.35 1.84 Quick ratio .87 .75 Inventory turnover 4.55 times 5.61 times Average collection period 35.3 days 20.5 days Total asset turnover 1.09 1.47 Debt ratio .30 .55 Times interest earned 12.3 8.0 Gross profit margin .202 .233 Operating profit margin .135 .133 Net profit margin .091 .072 Return on total assets (ROA) .099 .105 Return on common equity (ROE) .167 .234 Earnings per share $3.10 $2.15

Liquidity: The current and quick ratios show a weaker position relative to the industry average.

Activity: All activity ratios indicate a faster turnover of assets compared to the industry. Further analysis is necessary to determine whether the firm is in a weaker or stronger position than the industry. A higher inventory turnover ratio may indicate low inventory, resulting in stockouts and lost sales. A shorter average collection period may indicate extremely efficient receivables management, an overly zealous credit department, or credit terms which prohibit growth in sales.

Debt: The firm uses more debt than the average firm, resulting in higher interest obligations which could reduce its ability to meet other financial obligations.

Chapter 2 Financial Statements and Analysis Profitability: The firm has a higher gross profit margin than the industry, indicating either a higher sales price or a lower cost of goods sold. The operating profit margin is in line with the industry, but the net profit margin is lower than industry, an indication that expenses other than cost of goods sold are higher than the industry. Most likely, the damaging factor is high interest expenses due to a greater than average amount of debt. The increased leverage, however, magnifies the return the owners receive, as evidenced by the superior ROE.

b.Fox Manufacturing Company needs improvement in its liquidity ratios and

possibly a reduction in its total liabilities. The firm is more highly leveraged than the average firm in its industry and, therefore, has more financial risk. The profitability of the firm is lower than average but is enhanced by the use of debt in the capital structure, resulting in a superior ROE.

2-20 LG 6: Financial Statement Analysis

a.

Ratio Analysis

Zach Industries

Industry Actual Actual

Average 2002 2003

Current ratio 1.80 1.84 1.04

Quick ratio .70 .78 .38

Inventory turnover 2.50 2.59 2.33

Average collection period 37 days 36 days 56 days

Debt ratio 65% 67% 61.3%

Times interest earned 3.8 4.0 2.8

Gross profit margin 38% 40% 34%

Net profit margin 3.5% 3.6% 4.1%

Return on total assets 4.0% 4.0% 4.4%

Return on common equity 9.5% 8.0% 11.3%

Market/book ratio 1.1 1.2 1.3

b.

(1)Liquidity: Zach Industries' liquidity position has deteriorated from 2002 to

2003 and is inferior to the industry average. The firm may not be able to

satisfy short-term obligations as they come due.

(2)Activity: Zach Industries' ability to convert assets into cash has deteriorated

from 2002 to 2003. Examination into the cause of the 21-day increase in the

Part 1 Introduction to Managerial Finance

average collection period is warranted. Inventory turnover has also decreased

for the period under review and is fair compared to industry. The firm may be

holding slightly excessive inventory.

(3)Debt: Zach Industries' long-term debt position has improved since 2002 and

is below average. Zach Industries’ ability to service interest payments has

deteriorated and is below industry.

(4)Profitability:Although Zach Industries' gross profit margin is below its

industry average, indicating high cost of goods sold, the firm has a superior

net profit margin in comparison to average. The firm has lower than average

operating expenses. The firm has a superior return on investment and return

on equity in comparison to the industry and shows an upward trend.

(5)Market: Zach Industries' increase in their market price relative to their book

value per share indicates that the firm’s performance has been interpreted as

more positive in 2003 than in 2002 and it is a little higher than the industry.

Overall, the firm maintains superior profitability at the risk of illiquidity.

Investigation into the management of accounts receivable and inventory is warranted.

2-21 LG 6: Integrative–Complete Ratio Analysis

Ratio Analysis

Sterling Company

Industry

Actual Actual Actual Average TS: Time-series Ratio 2001 2002 2003 2003 CS: Cross-sectional Current ratio 1.40 1.55 1.67 1.85 TS: Improving

CS: Fair

Quick ratio 1.00 .92 .88 1.05 TS: Deteriorating

CS: Poor Inventory turnover 9.52 9.21 7.89 8.60 TS: Deteriorating

CS: Fair

Average collection 45.0 days 36.4 days 28.8 days 35 days TS: Improving period CS: Good

Industry

Actual Actual Actual Average TS: Time-series Ratio 2001 2002 2003 2003 CS: Cross-sectional

图形组态设计系统使用说明书样本

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土质分类及描述

一、杂填土:杂色,松散,大孔隙,上部为砼地坪,含较多的碎石。 二、淤泥质粉质粘土:灰色 灰黑色,流塑,部分夹有机质;无摇振反应,稍有光滑,干强度低,韧性低,有腐味 三、粘土:灰黄色,可塑,无摇振反应、光滑,干强度高,韧性高,局部分布。 四、粘土:灰黄褐黄色,硬塑,含少量的铁,锰质结核,可塑,无摇振反应,光滑,干强度高,韧性高。 五、粉质粘土:青灰色,软可塑状,为后期沉积,摇振反应无,稍有光滑,干强度中等,韧性中等。 六、粉质粘土:灰黄 ~ 褐黄色,硬塑,含青灰色粘土团块无摇振反应,稍有光滑,干强度中 等,韧性中等。 七、粉质粘土:灰黄 ~ 褐黄色,可塑,无摇振反应,稍有光滑,干强度中等,韧性中等。 八、 粉质粘土: 灰黄色, 可塑, 稍有光滑, 干强度中等, 韧性中等。 局部含团块状密实粉土。

九、粉质粘土:灰黄 ~ 褐黄色,钙质结核,硬塑,无摇振反应,稍有光滑,干强度中等,韧 性中等。 十、粉质粘土:灰黄 ~ 灰色,软 ~ 可塑,粉粒含量高,无摇振反应,稍有光滑,干强中等, 韧性中等。 十一、粉质粘土:上部浅灰色,中下部褐黄色,硬塑,含少量铁锰质结核,无摇振反应,切面光滑,干强度高,韧性高。 十二、粉质粘土夹粉土:灰黄 ~ 青灰色,可塑,含少量云母片,无摇振反应,稍有光滑,干 强度中等,韧性中等。 十三、粉砂:黄色,含云母片,中密。主要由石英等矿物组成,饱和状态。

十四、粉砂:上部灰黄色,底部浅灰色,含云母片,饱和状态,密实。 十五、粉质粘土夹粉土:灰黄色,软 ~ 可塑,无摇振反应,稍有光滑,干强度中等,韧性中 等。局部夹薄层粉土。 十六、粉土:灰黄,含云母片,很湿,稍密。摇振反应中等,无光泽反应,干强度低,韧性低。 十七、粉砂:灰黄,含云母片,饱和,密实,主要成分由长石、石英、云母等组成,磨园度 好、分、选性好。 十八、粉土:浅灰色,含云母片,摇振反应中等,无泽反应,干强度低,韧性低。 十九、粘土夹粉砂:灰黄色,褐黄色,可塑,含少量钙质结核核径为

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土的分类总结

一、土分类的思路 本质上来说,土的分类思路无非以下三种: 1、根据粒组(粒径大小)的组成及相对含量划分; 2、含水量影响土的性质,即塑性指标划分; 3、有机质的含量; 我们不妨先看看已有分类名称,有个大体印象先:但是感觉还是有点懵逼。 表1代号表 名称土的工程分类代号名称 基本代 号 B漂石BSl混合土漂石 C黏土CbSl混合土卵石 Cb卵石CH高液限黏土 F细粒土CHG含砾高液限黏土 G砾CHO有机质高液限黏土 H高液限CHS含砂高液限黏土 L低液限CL低液限黏土 M粉土CLG含砾低液限黏土 O有机质土CLO有机质低液限黏土 P级配不良CLS含砂低液限黏土 S砂GC黏土质砾 Sl混合土GF含细粒土砾 W级配良好GM粉土质砾 GP级配不良砾 GW级配良好砾 MH高液限粉土 MHG含砾高液限粉土 MHO有机质高液限粉土 MHS含砂高液限粉土 ML低液限粉土 MLG含砾低液限粉土 MLO有机质低液限粉土 MLS含砂低液限粉土 SC黏土质砂 SF含细粒土砂 SlB漂石混合土 SlCb卵石混合土 SM粉土质砂 SP级配不良砂 SW级配良好砂理解了分类的思路后,就要进行更进一步分类,就要知道分类的指标有哪些,哪些可以直接现场判定?哪些指标必须要做试验?小编总结如下:(1)土粒径大小;

(2)粒组相对含量(15%、50%、70%等); (3)级配(不均匀系数Cu、曲率系数Cc); (4)塑性指数Ip、液限Wl; (5)有机质含量; 当粒径比较大时,土的性质主要取决于粒径大小和它们的特征,此时,级配便成为了评价的主要指标;当粒径比较小时,土的性质主要取决于颗粒与水的相互作用,即塑性;而评价级配指标,通过不均匀系数Cu和曲率系数Cc,评价塑性通过液限和塑性指数。 下面讲讲哪些指标可以现场(肉眼等)鉴定,哪些指标必须通过试验才能确定。分类指标现场肉眼鉴别试验 粒径大小目测仪器量测 粒组相对含量摊平目测估计筛分 级配(Cu、Cc)目测筛分 塑性指数Ip、液限Wl 干强度、手捻、搓条、韧 性和摇震反应等代替塑 性 仪器测定 有机质含量闻气味、眼睛观察仪器测定 二、野外现场简易鉴定土的类别 土的分类包括现场简易鉴别和根据取土试验指标分类。而我们更关心现场鉴别属于何种土,或者取样时应该注意的事项,置于实验结果及更详细的分类,那是后面的工作。下面讲讲现场简易鉴别的几种方法: 表2土的简易鉴别法 性质方法详情 粒组组成比例目测法 参照《土的工程分类标准GB/T50145-2007》附录A土的 工程分类体系框图; 塑性手捻、搓条将稍湿或硬塑的小土块在手中揉捏,然后用拇指和食指将土捻成片状: 1、手感滑腻,无砂,捻面光滑者为塑性高; 2、稍有滑腻感,有砂粒,捻面稍有光泽者为塑性中等; 3、稍有粘性,砂感强,捻面粗糙者为塑性低; 搓条试验时应将含水量略大于塑限的湿土块,在手中揉捏均匀,再在手掌上搓成土条,根据土条不断裂而能达到的最小直径可区分为: 1、能搓成直径小于1mm土条者为塑性高; 2、能搓成直径为1~3mm土条而不断者为塑性中等; 3、搓成直径大于3mm的土条即断裂者为塑性低; 有机质闻臭味1、土中有机质应根据未完全分解的动植物残骸和无定形物质判定有机质呈黑色、青黑色或暗色,有臭味有弹性和海棉感可采用目测、手摸或嗅感判别当不能判别时,可采用下列方法。 2、将试样放入的烘箱中烘烤,当烘烤后试样的液限小于烘烤前试样液限的3/4时试样为有机质土。

信号与系统试题附答案

信科0801《信号与系统》复习参考练习题一、单项选择题:

14、已知连续时间信号,) 2(100)2(50sin )(--=t t t f 则信号t t f 410cos ·)(所占有的频带宽度为() A .400rad /s B 。200 rad /s C 。100 rad /s D 。50 rad /s

f如下图(a)所示,其反转右移的信号f1(t) 是() 15、已知信号)(t f如下图所示,其表达式是() 16、已知信号)(1t A、ε(t)+2ε(t-2)-ε(t-3) B、ε(t-1)+ε(t-2)-2ε(t-3) C、ε(t)+ε(t-2)-ε(t-3) D、ε(t-1)+ε(t-2)-ε(t-3) 17、如图所示:f(t)为原始信号,f1(t)为变换信号,则f1(t)的表达式是() A、f(-t+1) B、f(t+1) C、f(-2t+1) D、f(-t/2+1)

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十款设计师公认最实用的绘图软件评测

十款设计师公认最实用的绘图软件评测 导读: 很多人以为只有专业从事艺术设计类或者画画工作的人才会用到绘图软件,其实不然。在我们的日常生活中,也有许多需要用到绘图软件的职业,工程师、建筑师、原画师、网页设计师、电工师傅等等,在他们的日常工作中都会用到不同类型的绘图软件。 如今市面上有很多种类的绘图软件,但是他们的侧重点都不一样,有的侧重画工业图,有的偏向于艺术设计,还有的偏向于3D画图等,虽然都属于画图软件,但是涉及的方向大不一样。想要正确选择出适合自己的绘图软件,一个个去了解有些不太现实,下面就让小编为大家盘点一下目前公认最好用的10款绘图软件吧! 一、亿图图示专家:亿图图示Edraw Max是一款跨平台使用的全类型图形图表设计软件,用户可以通过它绘制260多种类型的图表,其中包含常用的:流程图、思维导图、信息图、组织结构图、甘特图、地图、线框图、数据模型图、UML以及网络拓扑图等等。 它拥有丰富的精美模板及矢量符号库,操作简单易上手,能让难以理解的文本和

表格转化为简单清晰的图表。除了具备多种绘图功能,亿图还能与其他办公软件相兼容,可以轻松通过软件将文件导出为Office word、excel、ppt、图片、pdf、html、svg、ps,甚至连Visio格式也不在话下! 二、Visio:是微软公司出品的一款的软件,它有助于 IT 和商务专业人员轻松地可视化、分析和交流复杂信息。丰富的组件库,各种各样的图表支持,和word 的无缝对接是visio的强项,但是由于其价格过于昂贵,并且无法在linux和osx下运行,可以选择的模板也比较少,加上设计风格过于扁平化,所以目前成为一款很容易被国产新秀软件替代的产品。

四大图谱综合解析

2013/12/2四大图谱综合解析[解] 从分子式CHO,求得不饱和度为零,故未知物应为512饱和脂肪族化合物。 1 某未知物分子式为CHO,它的质谱、红外光谱以及核磁共振谱如图,512未知物的红外光谱是在CCl溶液中测定的,样品的CCl稀溶液它的紫外吸收光谱在200 nm以上没有吸收,试确定该化合物结构。44-1的红外光谱在3640cm处有1尖峰,这是游离O H基的特征吸收峰。样品的CCl4浓溶液在3360cm-1处有1宽峰,但当溶液稀释后复又消失,说明存在着分子间氢键。未知物核磁共振谱中δ4. 1处的宽峰,经重水交换后消失。上述事实确定,未知物分子中存在着羟基。未知物核磁共振谱中δ0.9处的单峰,积分值相当3个质子,可看成是连在同一碳原子上的3个甲基。δ3.2处的单峰,积分值相当2个质子,对应1个亚甲基,看来该次甲基在分子中位于特丁基和羟基之间。质谱中从分子离子峰失去质量31(-CHOH)部分而形成基2峰m/e57的事实为上述看法提供了证据,因此,未知物的结构CH是3CCl稀溶液的红外光谱, CCl浓溶液44 CHOH C HC在3360cm-1处有1宽峰23 CH3 2. 某未知物,它的质谱、红外光谱以及核磁共振谱如图,它的根据这一结构式,未知物质谱中的主要碎片离子得到了如下紫外吸收光谱在210nm以上没有吸收,确定此未知物。解释。CH CH3+3.+ +C CH HCOH CHOH C HC3223 m/e31CH CH33 m/e88m/e57-2H -CH-H-CH33m/e29 CH m/e73CHC23+ m/e41 [解] 在未知物的质谱图中最高质荷比131处有1个丰度很小的峰,应从分子量减去这一部分,剩下的质量数是44,仅足以组为分子离子峰,即未知物的分子量为131。由于分子量为奇数,所以未成1个最简单的叔胺基。知物分子含奇数个氮原子。根据未知物的光谱数据中无伯或仲胺、腈、CH3N酞胺、硝基化合物或杂芳环化合物的特征,可假定氮原子以叔胺形式存CH3在。红外光谱中在1748 cm-1处有一强羰基吸收带,在1235 cm-1附近有1典型正好核磁共振谱中δ2. 20处的单峰(6H ),相当于2个连到氮原子上的宽强C-O-C伸缩振动吸收带,可见未知物分子中含有酯基。1040 的甲基。因此,未知物的结构为:-1cm处的吸收带则进一步指出未知物可能是伯醇乙酸酯。O核磁共振谱中δ1.95处的单峰(3H),相当1个甲基。从它的化学位移来CH3N看,很可能与羰基相邻。对于这一点,质谱中,m/e43的碎片离子CHCHCHOC223CH(CHC=O)提供了有力的证据。在核磁共振谱中有2个等面积(2H)的三重33峰,并且它们的裂距相等,相当于AA’XX'系统。有理由认为它们是2个此外,质谱中的基峰m /e 58是胺的特征碎片离子峰,它是由氮原子相连的亚甲-CH-CH,其中去屏蔽较大的亚甲基与酯基上的氧原子22的β位上的碳碳键断裂而生成的。结合其它光谱信息,可定出这个相连。碎片为至此,可知未知物具有下述的部分结构:CHO3NCH2CHCHCHOCCH32231 2013/12/23.某未知物CH的UV、IR、1H NMR、MS谱图及13C NMR数据如下,推[解] 1. 从分子式CH,计算不饱和度Ω=4;11161116导未知物结构。 2. 结构式推导未知物碳谱数据UV:240~275 nm 吸收带具有精细结构,表明化合物为芳烃;序号δc序号δc碳原子碳原子IR ::695、740 cm-1 表明分子中含有单取代苯环;(ppm)个数(ppm)个数MS :m/z 148为分子离子峰,其合理丢失一个碎片,得到m/z 91的苄基离子;1143.01632.01 313C NMR:在(40~10)ppm 的高场区有5个sp杂化碳原子;2128.52731.51 1H NMR:积分高度比表明分子中有1个CH和4个-CH-,其中(1.4~1.2)3128.02822.5132 ppm为2个CH的重叠峰;4125.51910.012因此,此化合物应含有一个苯环和一个CH的烷基。511536.01 1H NMR 谱中各峰裂分情况分析,取代基为正戊基,即化合物的结构为:23

土力学与基础工程知识点考点整理汇总

一、绪论 1.1土力学、地基及基础的概念 1.土:土是连续、坚固的岩石经风化、剥蚀、搬运、沉积而形成的散粒堆 积物。 2.地基:地基是指支撑基础的土体或岩体。(地基由地层构成,但地层不一 定是地基,地基是受土木工程影响的地层) 3.基础:基础是指墙、柱地面下的延伸扩大部分,其作用是将结构承受的 各种作用传递到地基上的结构组成部分。(基础可以分为浅基础和深基 础) 4.持力层:持力层是指埋置基础,直接支撑基础的土层。 5.下卧层:下卧层是指卧在持力层下方的土层。(软弱下卧层的强度远远小 于持力层的强度)。 6.基础工程:地基与基础是建筑物的根本,统称为基础工程。 7.土的工程性质:土的散粒性、渗透性、压缩性、整体强度(连接强度) 弱。 8.地基与基础设计必须满足的条件:①强度条件(按承载力极限状态设计): 即结构传来的荷载不超过结构的承载能力p f ≤;②变形条件:按正常使 s≤ 用极限状态设计,即控制基础沉降的范围使之不超过地基变形的允许值[] 二、土的性质及工程分类 2.1 概述 土的三相组成:土体一般由固相(固体颗粒)、液相(土中水)、气相(气体)三部分组成,简称为三相体系。 2.2 土的三相组成及土的结构 (一)土的固体颗粒物质分为无机矿物颗粒和有机质。矿物颗粒的成分有两大类:(1)原生矿物:即岩浆在冷凝过程中形成的矿物,如石英、长石、云母等。(2)次生矿物:系原生矿物经化学风化作用后而形成的新的矿物(如

粘土矿物)。它们的颗粒细小,呈片状,是粘性土固相的主要成分。次生矿物中粘性矿物对土的工程性质影响最大 —— 亲水性。 粘土矿物主要包括:高岭石、蒙脱石、伊利石。蒙脱石,它的晶胞是由两层硅氧晶片之间的夹一层铝氢氧晶片所组成称为2:1型结构单位层或三层型晶胞。它的亲水性特强工程性质差。伊利石它的工程性质介于蒙脱石与高岭石之间。高岭石,它是由一层硅氧晶片和一层铝氢氧晶片组成的晶胞,属于1:1型结构单位层或者两层。它的亲水性、膨胀性和收缩性均小于伊利石,更小于蒙脱石,遇水稳定,工程性质好。 土粒的大小称为粒度。在工程性质中,粒度不同、矿物成分不同,土的工程性质也就不同。工程上常把大小、性质相近的土粒合并为一组,称为粒组。而划分粒组的分界尺寸称为界限粒径。土粒粒组先粗分为巨粒、粗粒和细粒三个统称,再细分为六个粒组:漂石(块石)、卵石(碎石)、砾粒、砂粒、粉粒和黏粒。 土中所含各粒组的相对含量,以土粒总重的百分数表示,称为土的颗粒级配。土的级配曲线的纵坐标表示小于某土粒的累计质量百分比,横坐标则是用对数值表示土的粒径。由曲线形态可评定土颗粒大小的均匀程度。若曲线平缓则粒径大小相差悬殊,颗粒不均匀,级配良好;反之,则颗粒均匀,级配不良。 工程中常用不均匀系数u C 和曲率系数c C 来反映土颗粒的不均匀程度。 60 30u d C d = ()2301060c d C d d =? 10d —小于某粒径的土粒质量总土质量10%的粒径,称为有效粒径; 30d —小于某粒径的土粒质量总土质量30%的粒径,称为中值粒径; 60d —小于某粒径的土颗粒质量占总质量的60%的粒径,称限定粒径。 工程上对土的级配是否良好可按如下规定判断 ① 对于级配连续的土: Cu 5,级配良好;5Cu ,级配不良。 ② 对于级配不连续的土,级配曲线上呈台阶状,采用单一指标Cu 难以全面有效地判断土的级配好坏,需同时满足Cu 5和13Cu = 两个条件时,才为级配良好,反之级配不良。

信号与系统课后答案

1-1 (2)∞<<-∞=-t e t f t ,)( (3))()sin()(t t t f επ= (4))(sin )(t t f ε= (5))(sin )(t r t f = (7))(2)(k t f k ε= (10))(])1(1[)(k k f k ε-+= 1-3 1-5 判别下列各序列是否为周期性的。如果是,确定其周期。 (2))6 3cos()443cos()(2 π πππ+++=k k k f (5))sin(2cos 3)(5t t t f π+=

: 1-9 已知信号的波形如图1-11所示,分别画出 )(t f和 dt t df)( 的波形。 解:由图1-11知,) 3(t f-的波形如图1-12(a)所示() 3(t f-波形是由对) 2 3(t f- 的波形展宽为原来的两倍而得)。将) 3(t f-的波形反转而得到)3 (+ t f的波形,如图1-12(b)所示。再将)3 (+ t f的波形右移3个单位,就得到了)(t f,如图1-12(c)所示。dt t df)(的波形如图1-12(d)所示。 1-23 设系统的初始状态为)0(x,激励为)(? f,各系统的全响应)(?y与激励和初始状态的关系如下,试分析各系统是否是线性的。 (1)?+ =-t t dx x xf x e t y ) ( sin )0( )((2)?+ =t dx x f x t f t y ) ( )0( )( )( (3)?+ =t dx x f t x t y ) ( ])0( sin[ )((4))2 ( ) ( )0( )5.0( ) (- + =k f k f x k y k

NMR,VU,IR,MS四大图谱解析解析

13C-NMR谱图解析 13C-NMR谱图解析流程 1.分于式的确定 2.由宽带去偶语的谱线数L与分子式中破原子数m比较,判断分子的对称性. 若L=m,每一个碳原子的化学位移都不相同,表示分子没有对称性;若L

基团类型Qc/ppm 烷0-60 炔60-90 烯,芳香环90-160 羰基160 4.组合可能的结构式 在谱线归属明确的基础上,列出所有的结构单元,并合理地组合成一个或几个可能的工作结构。 5.确定结构式 用全部光谱材料和化学位移经验计算公式验证并确定惟一的或

可能性最大的结构式,或与标准谱图和数据表进行核对。经常使用的标准谱图和数据表有: 经验计算参数 1.烷烃及其衍生物的化学位移 一般烷烃灸值可用Lindeman-Adams经验公式近似地计算: ∑ Qc5.2 =nA - + 式中:一2.5为甲烷碳的化学位移九值;A为附加位移参数,列于下表,为具有某同一附加参数的碳原子数。 表2 注:1(3).1(4)为分别与三级碳、四级碳相连的一级碳;2(3)为与三级碳相连的二级碳,依此类推。 取代烷烃的Qc为烷烃的取代基效应位移参数的加和。表4一6给出各种取代基的位移参数

信号与系统课后习题答案

《低频电子线路》 一、单选题(每题2分,共28分:双号做双号题,单号做单号题) 1.若给PN结两端加正向电压时,空间电荷区将() A变窄 B基本不变 C变宽 D无法确定 2.设二极管的端电压为 U,则二极管的电流与电压之间是()A正比例关系 B对数关系 C指数关系 D无关系 3.稳压管的稳压区是其工作() A正向导通 B反向截止 C反向击穿 D反向导通 4.当晶体管工作在饱和区时,发射结电压和集电结电压应为 ( ) A前者反偏,后者也反偏 B前者反偏,后者正偏 C前者正偏,后者反偏 D前者正偏,后者也正偏 5.在本征半导体中加入何种元素可形成N型半导体。() A五价 B四价 C三价 D六价 6.加入何种元素可形成P 型半导体。() A五价 B四价 C三价 D六价 7.当温度升高时,二极管的反向饱和电流将()。

A 增大 B 不变 C 减小 D 不受温度影响 8. 稳压二极管两端的电压必须( )它的稳压值Uz 才有导通电流,否则处于截止状态。 A 等于 B 大于 C 小于 D 与Uz 无关 9. 用直流电压表测得放大电路中某三极管各极电位分别是2V 、6V 、2.7V ,则三个电极分别是( ) A (B 、C 、E ) B ( C 、B 、E ) C (E 、C 、B ) D (B 、C 、 E ) 10. 三极管的反向电流I CBO 是由( )形成的。 A 多数载流子的扩散运动 B 少数载流子的漂移运动 C 多数载流子的漂移运动 D 少数载流子的扩散运动 11. 晶体三极管工作在饱和状态时,集电极电流C i 将( )。 A 随 B i 增加而增加 B 随B i 增加而减少 C 与B i 无关,只决定于e R 和CE u D 不变 12. 理想二极管的正向电阻为( ) A A.零 B.无穷大 C.约几千欧 D.约几十欧 13. 放大器的输入电阻高,表明其放大微弱信号能力( )。 A 强 B 弱 C 一般 D 不一定 14. 某两级放大电路,第一级电压放大倍数为5,第二级电压 放大倍数为20,该放大电路的放大倍数为( )。 A 100

四大图谱综合解析

2013/12/2
四大图谱综合解析
1 某未知物分子式为C5 H12 O,它的质谱、红外光谱以及核磁共振谱如图,
它的紫外吸收光谱在200 nm以上没有吸收,试确定该化合物结构。
CCl4稀溶液的红外光谱, CCl4浓溶液 在3360cm-1处有1宽峰
[解] 从分子式C5H12O,求得不饱和度为零,故未知物应为 饱和脂肪族化合物。 未知物的红外光谱是在CCl4溶液中测定的,样品的CCl4稀溶液 的红外光谱在3640cm-1处有 1尖峰,这是游离 O H基的特征吸收 峰。样品的CCl4浓溶液在 3360cm-1处有 1宽峰,但当溶液稀释 后复又消失,说明存在着分子间氢键。未知物核磁共振谱中δ4. 1处的宽峰,经重水交换后消失。上述事实确定,未知物分子 中存在着羟基。 未知物核磁共振谱中δ0.9处的单峰,积分值相当3个质子,可 看成是连在同一碳原子上的3个甲基。δ3.2处的单峰,积分值 相当2个质子,对应1个亚甲基,看来该次甲基在分子中位于特 丁基和羟基之间。 质谱中从分子离子峰失去质量31(- CH2 OH)部分而形成基 峰m/e57的事实为上述看法提供了证据,因此,未知物的结构 CH3 是
H3C
C
CH3
CH2OH
根据这一结构式,未知物质谱中的主要碎片离子得到了如下 解释。
CH 3
2. 某未知物,它的质谱、红外光谱以及核磁共振谱如图,它的 紫外吸收光谱在210nm以上没有吸收,确定此未知物。
CH2
+ OH m/e31 -2H
+ . CH2OH
H3C
CH3
H3C
C
CH 3
C+
CH3
m/e88 -CH3 m/e29 m/e73
m/e57 -CH3 -H CH 3 C + CH 2
m/e41
[解] 在未知物的质谱图中最高质荷比131处有1个丰度很小的峰,应 为分子离子峰,即未知物的分子量为131。由于分子量为奇数,所以未 知物分子含奇数个氮原子。根据未知物的光谱数据中无伯或仲胺、腈、 酞胺、硝基化合物或杂芳环化合物的特征,可假定氮原子以叔胺形式存 在。 红外光谱中在1748 cm-1处有一强羰基吸收带,在1235 cm-1附近有1典型 的宽强C-O-C伸缩振动吸收带,可见未知物分子中含有酯基。1040 cm-1处的吸收带则进一步指出未知物可能是伯醇乙酸酯。 核磁共振谱中δ1.95处的单峰(3H),相当1个甲基。从它的化学位移来 看,很可能与羰基相邻。对于这一点,质谱中,m/e43的碎片离子 (CH3C=O)提供了有力的证据。在核磁共振谱中有2个等面积(2H)的三重 峰,并且它们的裂距相等,相当于AA’XX'系统。有理由认为它们是2个 相连的亚甲-CH2-CH2,其中去屏蔽较大的亚甲基与酯基上的氧原子 相连。 至此,可知未知物具有下述的部分结构:
O CH 2 CH 2 O C CH 3
从分子量减去这一部分,剩下的质量数是 44,仅足以组 成1个最简单的叔胺基。
CH 3 CH3 N
正好核磁共振谱中δ2. 20处的单峰(6H ),相当于2个连到氮原子上 的甲基。因此,未知物的结构为:
CH3 CH3 O N CH2 CH2 O C CH3
此外,质谱中的基峰m /e 58是胺的特征碎片离子峰,它是由氮原子 的β位上的碳碳键断裂而生成的。结合其它光谱信息,可定出这个 碎片为
CH3 CH3 N CH 2
1

土的分类标准

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式中d 60——在土的粒径分布曲线上的某粒径,小于该粒径的土粒质量为总土粒质量的60; d 10——在土的粒径分布曲线上的某粒径,小于该粒径的土粒质量为总土粒质量的10。 二、曲率系数,应按下式计算: 式中d 30——在土的粒径分布曲线上的某粒径,小于该粒径的土粒质量为总土粒质量的30。 第2.0.4条 细粒土应根据塑性图分类。塑性图的横坐标为土的液限(ωL ),纵坐标为塑性指数(I p )。本标准规定有两种塑性图,可根据下列所采用的液限标准进行选用: 一、当取质量为写76g 、锥角为30°的液限仪锥尖入土深度为17mm 对应的含水量为液限时,应按塑性图2.0.4-1分类。 图2.0.4-1 塑性图二、当取质量为76g 、锥角为30°的液限仪锥尖入土深度为10mm 对应的含水量为液限时,应按塑性图2.0.4-2 分类。 Ip w L

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12、级配曲线形状:陡竣、土粒大小均匀、级配差;平缓、土粒大小不均匀、级配好。 13、不均匀系数:6010 曲率系数: d30210*d60 d10(有效粒径)、d30、d60(限定粒径):小于某粒径的土粒含量为10%、 30%和60%时所对应的粒径。 14、结合水:指受电分子吸引力作用而吸附于土粒表面成薄膜状的水。 15、自由水:土粒电场影响范围以外的水。 16、重力水:受重力作用或压力差作用能自由流动的水。 17、毛细水:受水与空气界面的表面张力作用而存在于土细孔隙中的自由水。 14、土的重度γ:土单位体积的质量。 15、土粒比重 (土粒相对密度):土的固体颗粒质量与同体积的4℃时纯水的质量之比。 16、含水率w:土中水的质量和土粒质量之比 17、土的孔隙比e:土的孔隙体积与土的颗粒体积之比 18、土的孔隙率n:土的孔隙体积与土的总体积之比 19、饱和度:土中被水充满的孔隙体积与孔隙总体积之比 20、干密度:单位土体体积干土中固体颗粒部分的质量 21、土的饱和密度:土孔隙中充满水时的单位土体体积质量 22、土的密实度:单位体积土中固体颗粒的含量。

绘图系统设计及实现

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(七)多边形绘制实现13(八)喷枪的实现14(九)运行程序界面15 六、系统测试 16 七、结束语17 参考文献 18

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Design and implementation of drawing system Abstract Since the last century, the computer system has been extended to the painting industry, computer graphics technology has become an integral part of the system. The graphics editor graphics editing software is the foundation of almost all of the graphics editing software, are in possession of basic graphics editing capabilities based on the more complex functions. It is widely used in graphics today, research and development of graphics systems is very meaningful. This article focuses on the mapping system through the analysis of hardware and software configurations, the mapping system design and implementation of a reasonable set. MFC-based operating environment, through the CD, CDC class, and CDI, CGdiobject class applications, to achieve in the drawing to draw lines, rectangles, circles and other basic functions, implemented in the interface design of graphics operations, and thus from the underlying graphics system for simple implementation. Key words:Hardware system The software system structure Graphic operation and drawing technology draw tools GUI

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